diff --git a/dlls/msvcp90/locale.c b/dlls/msvcp90/locale.c
index 010284eb561..501443cfc14 100644
--- a/dlls/msvcp90/locale.c
+++ b/dlls/msvcp90/locale.c
@@ -4397,7 +4397,7 @@ num_get* num_get_short_use_facet(const locale *loc)
 
 static inline wchar_t mb_to_wc(char ch, const _Cvtvec *cvt)
 {
-    int state;
+    int state = 0;
     wchar_t ret;
 
     return _Mbrtowc(&ret, &ch, 1, &state, cvt) == 1 ? ret : 0;