diff --git a/main/config.w32.h.in b/main/config.w32.h.in
index a5acb96f91b..3ec7a766bc8 100644
--- a/main/config.w32.h.in
+++ b/main/config.w32.h.in
@@ -48,6 +48,7 @@
 #define HAVE_MBSTR_KR 1
 #define HAVE_MBSTR_RU 1
 #define HAVE_MBSTR_TW 1
+#define MBSTR_ENC_TRANS 1
 
 /* Enable / Disable MySQL extension (default: enabled) */
 #define HAVE_MYSQL 1