diff --git a/src/buffer.c b/src/buffer.c
index 0e13e1f..4563736 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1764,7 +1764,7 @@
 #endif
 
     /* Change directories when the 'acd' option is set. */
-    DO_AUTOCHDIR
+    DO_AUTOCHDIR;
 
 #ifdef FEAT_KEYMAP
     if (curbuf->b_kmap_state & KEYMAP_INIT)
diff --git a/src/dosinst.c b/src/dosinst.c
index 6a12e3d..ae5517d 100644
--- a/src/dosinst.c
+++ b/src/dosinst.c
@@ -23,7 +23,14 @@
 #define GVIMEXT32_PATH	    "GvimExt32\\gvimext.dll"
 
 /* Macro to do an error check I was typing over and over */
-#define CHECK_REG_ERROR(code) if (code != ERROR_SUCCESS) { printf("%ld error number:  %ld\n", (long)__LINE__, (long)code); return 1; }
+#define CHECK_REG_ERROR(code) \
+    do { \
+	if (code != ERROR_SUCCESS) \
+	{ \
+	    printf("%ld error number:  %ld\n", (long)__LINE__, (long)code); \
+	    return 1; \
+	} \
+    } while (0)
 
 int	has_vim = 0;		/* installable vim.exe exists */
 int	has_gvim = 0;		/* installable gvim.exe exists */
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index e13d34c..111fe01 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -2996,7 +2996,7 @@
     apply_autocmds(EVENT_BUFFILEPOST, NULL, NULL, FALSE, curbuf);
 
     /* Change directories when the 'acd' option is set. */
-    DO_AUTOCHDIR
+    DO_AUTOCHDIR;
     return OK;
 }
 
@@ -3254,7 +3254,7 @@
 	 * got changed or set. */
 	if (eap->cmdidx == CMD_saveas || name_was_missing)
 	{
-	    DO_AUTOCHDIR
+	    DO_AUTOCHDIR;
 	}
     }
 
@@ -4147,7 +4147,7 @@
 #endif
 
 	/* Change directories when the 'acd' option is set. */
-	DO_AUTOCHDIR
+	DO_AUTOCHDIR;
 
 	/*
 	 * Careful: open_buffer() and apply_autocmds() may change the current
diff --git a/src/gui_at_sb.c b/src/gui_at_sb.c
index 659e934..1816daa 100644
--- a/src/gui_at_sb.c
+++ b/src/gui_at_sb.c
@@ -645,7 +645,11 @@
     static Boolean
 CompareEvents(XEvent *oldEvent, XEvent *newEvent)
 {
-#define Check(field) if (newEvent->field != oldEvent->field) return False;
+#define Check(field) \
+    do { \
+	if (newEvent->field != oldEvent->field) \
+	    return False; \
+    } while (0)
 
     Check(xany.display);
     Check(xany.type);
diff --git a/src/macros.h b/src/macros.h
index f5440b1..fcd1a82 100644
--- a/src/macros.h
+++ b/src/macros.h
@@ -230,9 +230,9 @@
 #endif
 
 #ifdef STARTUPTIME
-# define TIME_MSG(s) { if (time_fd != NULL) time_msg(s, NULL); }
+# define TIME_MSG(s) do { if (time_fd != NULL) time_msg(s, NULL); } while (0)
 #else
-# define TIME_MSG(s)
+# define TIME_MSG(s) do { /**/ } while (0)
 #endif
 
 #ifdef FEAT_VREPLACE
@@ -289,9 +289,9 @@
 #endif
 
 #ifdef FEAT_AUTOCHDIR
-# define DO_AUTOCHDIR if (p_acd) do_autochdir();
+# define DO_AUTOCHDIR do { if (p_acd) do_autochdir(); } while (0)
 #else
-# define DO_AUTOCHDIR
+# define DO_AUTOCHDIR do { /**/ } while (0)
 #endif
 
 #define RESET_BINDING(wp)  (wp)->w_p_scb = FALSE; (wp)->w_p_crb = FALSE
diff --git a/src/main.c b/src/main.c
index 0b0fac6..6d351b6 100644
--- a/src/main.c
+++ b/src/main.c
@@ -824,7 +824,7 @@
     no_wait_return = FALSE;
 
     /* 'autochdir' has been postponed */
-    DO_AUTOCHDIR
+    DO_AUTOCHDIR;
 
 #ifdef FEAT_TERMRESPONSE
     /* Requesting the termresponse is postponed until here, so that a "-c q"
diff --git a/src/memline.c b/src/memline.c
index 5ecb32c..4be1036 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -8,8 +8,8 @@
  */
 
 /* for debugging */
-/* #define CHECK(c, s)	if (c) EMSG(s) */
-#define CHECK(c, s)
+/* #define CHECK(c, s)	do { if (c) EMSG(s); } while (0) */
+#define CHECK(c, s)	do { /**/ } while (0)
 
 /*
  * memline.c: Contains the functions for appending, deleting and changing the
diff --git a/src/option.c b/src/option.c
index 084e5e1..48432bb 100644
--- a/src/option.c
+++ b/src/option.c
@@ -8456,7 +8456,7 @@
     else if ((int *)varp == &p_acd)
     {
 	/* Change directories when the 'acd' option is set now. */
-	DO_AUTOCHDIR
+	DO_AUTOCHDIR;
     }
 #endif
 
diff --git a/src/os_vms.c b/src/os_vms.c
index 02c594c..84f84ac 100644
--- a/src/os_vms.c
+++ b/src/os_vms.c
@@ -83,7 +83,7 @@
 #define EXPL_ALLOC_INC 64
 
 #define EQN(S1,S2,LN) (strncmp(S1,S2,LN) == 0)
-#define SKIP_FOLLOWING_SLASHES(Str) while (Str[1] == '/') ++Str
+#define SKIP_FOLLOWING_SLASHES(Str) do { while (Str[1] == '/') ++Str; } while (0)
 
 
 /*
diff --git a/src/screen.c b/src/screen.c
index 77a3c18..bcfaabe 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -2705,15 +2705,21 @@
     }
 
 #ifdef FEAT_RIGHTLEFT
-# define RL_MEMSET(p, v, l)  if (wp->w_p_rl) \
-				for (ri = 0; ri < l; ++ri) \
-				   ScreenAttrs[off + (wp->w_width - (p) - (l)) + ri] = v; \
-			     else \
-				for (ri = 0; ri < l; ++ri) \
-				   ScreenAttrs[off + (p) + ri] = v
+# define RL_MEMSET(p, v, l) \
+    do { \
+	if (wp->w_p_rl) \
+	    for (ri = 0; ri < l; ++ri) \
+	       ScreenAttrs[off + (wp->w_width - (p) - (l)) + ri] = v; \
+	 else \
+	    for (ri = 0; ri < l; ++ri) \
+	       ScreenAttrs[off + (p) + ri] = v; \
+    } while (0)
 #else
-# define RL_MEMSET(p, v, l)   for (ri = 0; ri < l; ++ri) \
-				 ScreenAttrs[off + (p) + ri] = v
+# define RL_MEMSET(p, v, l) \
+    do { \
+	for (ri = 0; ri < l; ++ri) \
+	    ScreenAttrs[off + (p) + ri] = v; \
+    } while (0)
 #endif
 
     /* Set all attributes of the 'number' or 'relativenumber' column and the
diff --git a/src/version.c b/src/version.c
index 4fc5de0..63c274f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1688,
+/**/
     1687,
 /**/
     1686,
diff --git a/src/window.c b/src/window.c
index 337f84d..a1b2a45 100644
--- a/src/window.c
+++ b/src/window.c
@@ -99,9 +99,16 @@
 	Prenum1 = Prenum;
 
 #ifdef FEAT_CMDWIN
-# define CHECK_CMDWIN if (cmdwin_type != 0) { EMSG(_(e_cmdwin)); break; }
+# define CHECK_CMDWIN \
+    do { \
+	if (cmdwin_type != 0) \
+	{ \
+	    EMSG(_(e_cmdwin)); \
+	    return; \
+	} \
+    } while (0)
 #else
-# define CHECK_CMDWIN
+# define CHECK_CMDWIN do { /**/ } while (0)
 #endif
 
     switch (nchar)
@@ -110,7 +117,7 @@
     case 'S':
     case Ctrl_S:
     case 's':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		reset_VIsual_and_resel();	/* stop Visual mode */
 #ifdef FEAT_QUICKFIX
 		/* When splitting the quickfix window open a new buffer in it,
@@ -127,7 +134,7 @@
 /* split current window in two parts, vertically */
     case Ctrl_V:
     case 'v':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		reset_VIsual_and_resel();	/* stop Visual mode */
 #ifdef FEAT_QUICKFIX
 		/* When splitting the quickfix window open a new buffer in it,
@@ -144,7 +151,7 @@
 /* split current window and edit alternate file */
     case Ctrl_HAT:
     case '^':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		reset_VIsual_and_resel();	/* stop Visual mode */
 		cmd_with_count("split #", cbuf, sizeof(cbuf), Prenum);
 		do_cmdline_cmd(cbuf);
@@ -153,7 +160,7 @@
 /* open new window */
     case Ctrl_N:
     case 'n':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		reset_VIsual_and_resel();	/* stop Visual mode */
 #ifdef FEAT_QUICKFIX
 newwindow:
@@ -191,7 +198,7 @@
 /* close preview window */
     case Ctrl_Z:
     case 'z':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		reset_VIsual_and_resel();	/* stop Visual mode */
 		do_cmdline_cmd((char_u *)"pclose");
 		break;
@@ -211,7 +218,7 @@
 /* close all but current window */
     case Ctrl_O:
     case 'o':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		reset_VIsual_and_resel();	/* stop Visual mode */
 		cmd_with_count("only", cbuf, sizeof(cbuf), Prenum);
 		do_cmdline_cmd(cbuf);
@@ -222,7 +229,7 @@
     case 'w':
 /* cursor to previous window with wrap around */
     case 'W':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		if (ONE_WINDOW && Prenum != 1)	/* just one window */
 		    beep_flush();
 		else
@@ -260,7 +267,7 @@
     case 'j':
     case K_DOWN:
     case Ctrl_J:
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		win_goto_ver(FALSE, Prenum1);
 		break;
 
@@ -268,7 +275,7 @@
     case 'k':
     case K_UP:
     case Ctrl_K:
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		win_goto_ver(TRUE, Prenum1);
 		break;
 
@@ -277,7 +284,7 @@
     case K_LEFT:
     case Ctrl_H:
     case K_BS:
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		win_goto_hor(TRUE, Prenum1);
 		break;
 
@@ -285,7 +292,7 @@
     case 'l':
     case K_RIGHT:
     case Ctrl_L:
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		win_goto_hor(FALSE, Prenum1);
 		break;
 
@@ -338,21 +345,21 @@
 /* exchange current and next window */
     case 'x':
     case Ctrl_X:
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		win_exchange(Prenum);
 		break;
 
 /* rotate windows downwards */
     case Ctrl_R:
     case 'r':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		reset_VIsual_and_resel();	/* stop Visual mode */
 		win_rotate(FALSE, (int)Prenum1);    /* downwards */
 		break;
 
 /* rotate windows upwards */
     case 'R':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		reset_VIsual_and_resel();	/* stop Visual mode */
 		win_rotate(TRUE, (int)Prenum1);	    /* upwards */
 		break;
@@ -362,7 +369,7 @@
     case 'J':
     case 'H':
     case 'L':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		win_totop((int)Prenum,
 			((nchar == 'H' || nchar == 'L') ? WSP_VERT : 0)
 			| ((nchar == 'H' || nchar == 'K') ? WSP_TOP : WSP_BOT));
@@ -428,7 +435,7 @@
 /* jump to tag and split window if tag exists (in preview window) */
 #if defined(FEAT_QUICKFIX)
     case '}':
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		if (Prenum)
 		    g_do_tagpreview = Prenum;
 		else
@@ -437,7 +444,7 @@
 		/* FALLTHROUGH */
     case ']':
     case Ctrl_RSB:
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		/* keep Visual mode, can select words to use as a tag */
 		if (Prenum)
 		    postponed_split = Prenum;
@@ -459,7 +466,7 @@
     case 'F':
     case Ctrl_F:
 wingotofile:
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 
 		ptr = grab_file_name(Prenum1, &lnum);
 		if (ptr != NULL)
@@ -503,7 +510,7 @@
 		/* FALLTHROUGH */
     case 'd':			    /* Go to definition, using 'define' */
     case Ctrl_D:
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 		if ((len = find_ident_under_cursor(&ptr, FIND_IDENT)) == 0)
 		    break;
 		find_pattern_in_path(ptr, 0, len, TRUE,
@@ -534,7 +541,7 @@
 /* CTRL-W g  extended commands */
     case 'g':
     case Ctrl_G:
-		CHECK_CMDWIN
+		CHECK_CMDWIN;
 #ifdef USE_ON_FLY_SCROLL
 		dont_scroll = TRUE;		/* disallow scrolling here */
 #endif
@@ -4273,9 +4280,9 @@
     win_T	*wp,
     int		undo_sync,
     int		curwin_invalid,
-    int		trigger_new_autocmds UNUSED,
-    int		trigger_enter_autocmds UNUSED,
-    int		trigger_leave_autocmds UNUSED)
+    int		trigger_new_autocmds,
+    int		trigger_enter_autocmds,
+    int		trigger_leave_autocmds)
 {
     int		other_buffer = FALSE;
 
@@ -4385,7 +4392,7 @@
 #endif
 
     /* Change directories when the 'acd' option is set. */
-    DO_AUTOCHDIR
+    DO_AUTOCHDIR;
 }