diff --git a/abspath.c b/abspath.c
index 5edb4e7816..2825de8591 100644
--- a/abspath.c
+++ b/abspath.c
@@ -167,7 +167,6 @@ const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
 	strbuf_add(&path, pfx, pfx_len);
 	strbuf_addstr(&path, arg);
 #else
-	char *p;
 	/* don't add prefix to absolute paths, but still replace '\' by '/' */
 	strbuf_reset(&path);
 	if (is_absolute_path(arg))
@@ -175,9 +174,7 @@ const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
 	else if (pfx_len)
 		strbuf_add(&path, pfx, pfx_len);
 	strbuf_addstr(&path, arg);
-	for (p = path.buf + pfx_len; *p; p++)
-		if (*p == '\\')
-			*p = '/';
+	convert_slashes(path.buf + pfx_len);
 #endif
 	return path.buf;
 }
diff --git a/compat/mingw.c b/compat/mingw.c
index 54c82ecf20..0413d5c3cd 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -763,15 +763,12 @@ struct tm *localtime_r(const time_t *timep, struct tm *result)
 
 char *mingw_getcwd(char *pointer, int len)
 {
-	int i;
 	wchar_t wpointer[MAX_PATH];
 	if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 		return NULL;
 	if (xwcstoutf(pointer, wpointer, len) < 0)
 		return NULL;
-	for (i = 0; pointer[i]; i++)
-		if (pointer[i] == '\\')
-			pointer[i] = '/';
+	convert_slashes(pointer);
 	return pointer;
 }
 
@@ -2112,9 +2109,7 @@ static void setup_windows_environment()
 		 * executable (by not mistaking the dir separators
 		 * for escape characters).
 		 */
-		for (; *tmp; tmp++)
-			if (*tmp == '\\')
-				*tmp = '/';
+		convert_slashes(tmp);
 	}
 
 	/* simulate TERM to enable auto-color (see color.c) */