diff --git a/src/misc1.c b/src/misc1.c
index f09a5bd..8e3552a 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -5396,8 +5396,7 @@
 cin_ispreproc(s)
     char_u *s;
 {
-    s = skipwhite(s);
-    if (*s == '#')
+    if (*skipwhite(s) == '#')
 	return TRUE;
     return FALSE;
 }
@@ -5513,6 +5512,10 @@
     else
 	s = *sp;
 
+    /* Ignore line starting with #. */
+    if (cin_ispreproc(s))
+	return FALSE;
+
     while (*s && *s != '(' && *s != ';' && *s != '\'' && *s != '"')
     {
 	if (cin_iscomment(s))	/* ignore comments */
@@ -5538,13 +5541,29 @@
 		retval = TRUE;
 	    goto done;
 	}
-	if (*s == ',' && cin_nocode(s + 1))
+	if ((*s == ',' && cin_nocode(s + 1)) || s[1] == NUL || cin_nocode(s))
 	{
-	    /* ',' at the end: continue looking in the next line */
+	    int comma = (*s == ',');
+
+	    /* ',' at the end: continue looking in the next line.
+	     * At the end: check for ',' in the next line, for this style:
+	     * func(arg1
+	     *       , arg2) */
+	    for (;;)
+	    {
+		if (lnum >= curbuf->b_ml.ml_line_count)
+		    break;
+		s = ml_get(++lnum);
+		if (!cin_ispreproc(s))
+		    break;
+	    }
 	    if (lnum >= curbuf->b_ml.ml_line_count)
 		break;
-
-	    s = ml_get(++lnum);
+	    /* Require a comma at end of the line or a comma or ')' at the
+	     * start of next line. */
+	    s = skipwhite(s);
+	    if (!comma && *s != ',' && *s != ')')
+		break;
 	}
 	else if (cin_iscomment(s))	/* ignore comments */
 	    s = cin_skipcomment(s);
diff --git a/src/testdir/test3.in b/src/testdir/test3.in
index 35582bd..62402fb 100644
--- a/src/testdir/test3.in
+++ b/src/testdir/test3.in
Binary files differ
diff --git a/src/testdir/test3.ok b/src/testdir/test3.ok
index 8c015a3..4e2a648 100644
--- a/src/testdir/test3.ok
+++ b/src/testdir/test3.ok
@@ -1183,3 +1183,24 @@
 		foo;
 }
 
+
+void func(int a
+#if defined(FOO)
+		  , int b
+		  , int c
+#endif
+		 )
+{
+}
+
+
+	void
+func(int a
+#if defined(FOO)
+	 , int b
+	 , int c
+#endif
+	)
+{
+}
+
diff --git a/src/version.c b/src/version.c
index 37a7034..8fb7cf3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    164,
+/**/
     163,
 /**/
     162,