diff --git a/libretro-common/include/compat/posix_string.h b/libretro-common/include/compat/posix_string.h
index 695426e2f5..2421ca2674 100644
--- a/libretro-common/include/compat/posix_string.h
+++ b/libretro-common/include/compat/posix_string.h
@@ -46,7 +46,8 @@ char *strtok_r(char *str, const char *delim, char **saveptr);
 int strcasecmp(const char *a, const char *b);
 char *strdup(const char *orig);
 
-#if _MSC_VER < 1200
+/* isblank is availables ince MSVC 2013 */
+#if _MSC_VER < 1800
 #undef isblank
 #define isblank(c)       retro_isblank__(c)
 int isblank(int c);