diff --git a/src/xpdev/strwrap.h b/src/xpdev/strwrap.h
index e52986f122e4baa1a5fe5ec95b0fd4daa36fdf1d..482fa1f53ba522e5a23485a87ef00b6bd5a0d04d 100644
--- a/src/xpdev/strwrap.h
+++ b/src/xpdev/strwrap.h
@@ -24,7 +24,9 @@ extern "C" {
 #endif
 
 char *strndup(const char *str, size_t maxlen);
+#if defined(_WIN32) && !defined(_MSC_VER)
 size_t strnlen(const char *s, size_t maxlen);
+#endif
 
 #if defined(__cplusplus)
 }