diff --git a/main/config.w32.h.in b/main/config.w32.h.in
index a7a69485328..b7ba0e3d036 100644
--- a/main/config.w32.h.in
+++ b/main/config.w32.h.in
@@ -41,14 +41,14 @@
 /* Enable / Disable FTP extension (default: enabled) */
 #define HAVE_FTP 1
 
-/* Enable / Disable MBSTRING extension (default: enabled) */
-#define HAVE_MBSTRING 1
-#define HAVE_MBREGEX 1
-#define HAVE_MBSTR_CN 1
-#define HAVE_MBSTR_JA 1
-#define HAVE_MBSTR_KR 1
-#define HAVE_MBSTR_RU 1
-#define HAVE_MBSTR_TW 1
+/* Enable / Disable MBSTRING extension (default: disabled) */
+#define HAVE_MBSTRING 0
+#define HAVE_MBREGEX 0
+#define HAVE_MBSTR_CN 0
+#define HAVE_MBSTR_JA 0
+#define HAVE_MBSTR_KR 0
+#define HAVE_MBSTR_RU 0
+#define HAVE_MBSTR_TW 0
 
 /* Enable / Disable MySQL extension (default: enabled) */
 #define HAVE_MYSQL 1