diff --git a/Filelist b/Filelist
index ebf19c8..3195a8d 100644
--- a/Filelist
+++ b/Filelist
@@ -497,7 +497,6 @@
 SRC_DOS_UNIX =	\
 		src/gui_xim.c \
 		src/if_cscope.c \
-		src/if_cscope.h \
 		src/if_lua.c \
 		src/if_mzsch.c \
 		src/if_mzsch.h \
diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index d9a50d2..4511109 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -1237,7 +1237,7 @@
 $(OUTDIR)/gui_w32.o:	gui_w32.c $(INCL) $(GUI_INCL) version.h
 	$(CC) -c $(CFLAGS) gui_w32.c -o $@
 
-$(OUTDIR)/if_cscope.o:	if_cscope.c $(INCL) if_cscope.h
+$(OUTDIR)/if_cscope.o:	if_cscope.c $(INCL)
 	$(CC) -c $(CFLAGS) if_cscope.c -o $@
 
 $(OUTDIR)/if_mzsch.o:	if_mzsch.c $(INCL) $(MZSCHEME_INCL) $(MZ_EXTRA_DEP)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index f2a45a0..0f6f676 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -1670,7 +1670,7 @@
 
 $(OUTDIR)/gui_dwrite.obj:	$(OUTDIR) gui_dwrite.cpp gui_dwrite.h
 
-$(OUTDIR)/if_cscope.obj: $(OUTDIR) if_cscope.c  $(INCL) if_cscope.h
+$(OUTDIR)/if_cscope.obj: $(OUTDIR) if_cscope.c  $(INCL)
 
 $(OUTDIR)/if_lua.obj: $(OUTDIR) if_lua.c  $(INCL)
 	$(CC) $(CFLAGS_OUTDIR) $(LUA_INC) if_lua.c
diff --git a/src/Make_vms.mms b/src/Make_vms.mms
index 54aa4c3..5ee4aab 100644
--- a/src/Make_vms.mms
+++ b/src/Make_vms.mms
@@ -908,7 +908,7 @@
 if_cscope.obj : if_cscope.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h termdefs.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
- errors.h globals.h if_cscope.h
+ errors.h globals.h
 if_xcmdsrv.obj : if_xcmdsrv.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h termdefs.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
diff --git a/src/Makefile b/src/Makefile
index c65781e..cdb491b 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3922,7 +3922,7 @@
 objects/if_cscope.o: if_cscope.c vim.h protodef.h auto/config.h feature.h \
  os_unix.h auto/osdef.h ascii.h keymap.h termdefs.h macros.h option.h beval.h \
  proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \
- proto.h globals.h errors.h if_cscope.h
+ proto.h globals.h errors.h
 objects/if_xcmdsrv.o: if_xcmdsrv.c vim.h protodef.h auto/config.h feature.h \
  os_unix.h auto/osdef.h ascii.h keymap.h termdefs.h macros.h option.h beval.h \
  proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \
diff --git a/src/if_cscope.c b/src/if_cscope.c
index 28f7db2..ccccb51 100644
--- a/src/if_cscope.c
+++ b/src/if_cscope.c
@@ -18,7 +18,62 @@
 #if defined(UNIX)
 # include <sys/wait.h>
 #endif
-#include "if_cscope.h"
+
+#if defined (MSWIN)
+# ifndef WIN32_LEAN_AND_MEAN
+#  define WIN32_LEAN_AND_MEAN
+# endif
+# include <windows.h>
+#endif
+
+#define CSCOPE_SUCCESS		0
+#define CSCOPE_FAILURE		-1
+
+#define	CSCOPE_DBFILE		"cscope.out"
+#define	CSCOPE_PROMPT		">> "
+
+/*
+ * See ":help cscope-find" for the possible queries.
+ */
+
+typedef struct {
+    char *  name;
+    int     (*func)(exarg_T *eap);
+    char *  help;
+    char *  usage;
+    int	    cansplit;		// if supports splitting window
+} cscmd_T;
+
+typedef struct csi {
+    char *	    fname;	// cscope db name
+    char *	    ppath;	// path to prepend (the -P option)
+    char *	    flags;	// additional cscope flags/options (e.g, -p2)
+#if defined(UNIX)
+    pid_t	    pid;	// PID of the connected cscope process.
+    dev_t	    st_dev;	// ID of dev containing cscope db
+    ino_t	    st_ino;	// inode number of cscope db
+#else
+# if defined(MSWIN)
+    DWORD	    pid;	// PID of the connected cscope process.
+    HANDLE	    hProc;	// cscope process handle
+    DWORD	    nVolume;	// Volume serial number, instead of st_dev
+    DWORD	    nIndexHigh;	// st_ino has no meaning in the Windows
+    DWORD	    nIndexLow;
+# endif
+#endif
+
+    FILE *	    fr_fp;	// from cscope: FILE.
+    FILE *	    to_fp;	// to cscope: FILE.
+} csinfo_T;
+
+typedef enum { Add, Find, Help, Kill, Reset, Show } csid_e;
+
+typedef enum {
+    Store,
+    Get,
+    Free,
+    Print
+} mcmd_e;
 
 static int	    cs_add(exarg_T *eap);
 static int	    cs_add_common(char *, char *, char *);
@@ -811,12 +866,16 @@
 	return CSCOPE_FAILURE;
     }
 
-    switch (csinfo[i].pid = fork())
+    if ((csinfo[i].pid = fork()) == -1)
     {
-    case -1:
 	(void)emsg(_(e_could_not_fork_for_cscope));
 	goto err_closing;
-    case 0:				// child: run cscope.
+    }
+    else if (csinfo[i].pid == 0)	// child: run cscope.
+    {
+	char **argv = NULL;
+	int argc = 0;
+
 	if (dup2(to_cs[0], STDIN_FILENO) == -1)
 	    PERROR("cs_create_connection 1");
 	if (dup2(from_cs[1], STDOUT_FILENO) == -1)
@@ -856,7 +915,7 @@
 	if ((prog = alloc(MAXPATHL + 1)) == NULL)
 	{
 #ifdef UNIX
-	    return CSCOPE_FAILURE;
+	    exit(EXIT_FAILURE);
 #else
 	    // MSWIN
 	    goto err_closing;
@@ -873,7 +932,7 @@
 	    {
 		vim_free(prog);
 #ifdef UNIX
-		return CSCOPE_FAILURE;
+		exit(EXIT_FAILURE);
 #else
 		// MSWIN
 		goto err_closing;
@@ -892,20 +951,16 @@
 	    vim_free(prog);
 	    vim_free(ppath);
 #ifdef UNIX
-	    return CSCOPE_FAILURE;
+	    exit(EXIT_FAILURE);
 #else
 	    // MSWIN
 	    goto err_closing;
 #endif
 	}
 
-	// run the cscope command; is there execl for non-unix systems?
-#if defined(UNIX)
-	(void)sprintf(cmd, "exec %s -dl -f %s", prog, csinfo[i].fname);
-#else
-	// MSWIN
+	// run the cscope command
 	(void)sprintf(cmd, "%s -dl -f %s", prog, csinfo[i].fname);
-#endif
+
 	if (csinfo[i].ppath != NULL)
 	{
 	    (void)strcat(cmd, " -P");
@@ -932,12 +987,17 @@
 	    PERROR(_("cs_create_connection setpgid failed"));
 #  endif
 # endif
-	if (execl("/bin/sh", "sh", "-c", cmd, (char *)NULL) == -1)
+	if (build_argv_from_string((char_u *)cmd, &argv, &argc) == FAIL)
+	    exit(EXIT_FAILURE);
+
+	if (execvp(argv[0], argv) == -1)
 	    PERROR(_("cs_create_connection exec failed"));
 
 	exit(127);
 	// NOTREACHED
-    default:	// parent.
+    }
+    else	// parent.
+    {
 	/*
 	 * Save the file descriptors for later duplication, and
 	 * reopen as streams.
@@ -950,10 +1010,7 @@
 	// close unused
 	(void)close(to_cs[0]);
 	(void)close(from_cs[1]);
-
-	break;
     }
-
 #else
     // MSWIN
     // Create a new process to run cscope and use pipes to talk with it
diff --git a/src/if_cscope.h b/src/if_cscope.h
deleted file mode 100644
index 5c031a3..0000000
--- a/src/if_cscope.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/* vi:set ts=8 sts=4 sw=4 noet:
- *
- * CSCOPE support for Vim added by Andy Kahn <kahn@zk3.dec.com>
- * Ported to Win32 by Sergey Khorev <sergey.khorev@gmail.com>
- *
- * The basic idea/structure of cscope for Vim was borrowed from Nvi.
- * There might be a few lines of code that look similar to what Nvi
- * has.  If this is a problem and requires inclusion of the annoying
- * BSD license, then sue me; I'm not worth much anyway.
- */
-
-#if defined(FEAT_CSCOPE) || defined(PROTO)
-
-#if defined (MSWIN)
-# ifndef WIN32_LEAN_AND_MEAN
-#  define WIN32_LEAN_AND_MEAN
-# endif
-# include <windows.h>
-#endif
-
-#define CSCOPE_SUCCESS		0
-#define CSCOPE_FAILURE		-1
-
-#define	CSCOPE_DBFILE		"cscope.out"
-#define	CSCOPE_PROMPT		">> "
-
-/*
- * See ":help cscope-find" for the possible queries.
- */
-
-typedef struct {
-    char *  name;
-    int     (*func)(exarg_T *eap);
-    char *  help;
-    char *  usage;
-    int	    cansplit;		// if supports splitting window
-} cscmd_T;
-
-typedef struct csi {
-    char *	    fname;	// cscope db name
-    char *	    ppath;	// path to prepend (the -P option)
-    char *	    flags;	// additional cscope flags/options (e.g, -p2)
-#if defined(UNIX)
-    pid_t	    pid;	// PID of the connected cscope process.
-    dev_t	    st_dev;	// ID of dev containing cscope db
-    ino_t	    st_ino;	// inode number of cscope db
-#else
-# if defined(MSWIN)
-    DWORD	    pid;	// PID of the connected cscope process.
-    HANDLE	    hProc;	// cscope process handle
-    DWORD	    nVolume;	// Volume serial number, instead of st_dev
-    DWORD	    nIndexHigh;	// st_ino has no meaning in the Windows
-    DWORD	    nIndexLow;
-# endif
-#endif
-
-    FILE *	    fr_fp;	// from cscope: FILE.
-    FILE *	    to_fp;	// to cscope: FILE.
-} csinfo_T;
-
-typedef enum { Add, Find, Help, Kill, Reset, Show } csid_e;
-
-typedef enum {
-    Store,
-    Get,
-    Free,
-    Print
-} mcmd_e;
-
-
-#endif	// FEAT_CSCOPE
diff --git a/src/testdir/test_cscope.vim b/src/testdir/test_cscope.vim
index c01ca32..ba19419 100644
--- a/src/testdir/test_cscope.vim
+++ b/src/testdir/test_cscope.vim
@@ -246,7 +246,7 @@
     " Test: 'csprg' option
     call assert_equal('cscope', &csprg)
     set csprg=doesnotexist
-    call assert_fails('cscope add Xcscope2.out', 'E609:')
+    call assert_fails('cscope add Xcscope2.out', 'E262:')
     set csprg=cscope
 
     " Test: multiple cscope connections
diff --git a/src/version.c b/src/version.c
index 0089232..67a258a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4081,
+/**/
     4080,
 /**/
     4079,