diff --git a/src/common/cmdline.cpp b/src/common/cmdline.cpp
index a9020f17d1..1362a65773 100644
--- a/src/common/cmdline.cpp
+++ b/src/common/cmdline.cpp
@@ -278,7 +278,8 @@ void wxCmdLineParserData::SetArguments(int argc, char **argv)
     // temporarily change the locale here. The only drawback is that changing
     // the locale is thread-unsafe but precisely because we're called so early
     // it's hopefully safe to assume that no other threads had been created yet.
-    char * const locOld = SetAllLocaleFacets("");
+    char * const locOld = SetAllLocaleFacets(NULL);
+    SetAllLocaleFacets("");
     wxON_BLOCK_EXIT1( SetAllLocaleFacets, locOld );
 
     for ( int n = 0; n < argc; n++ )