diff --git a/pjlib/src/pjlib-test/main_win32.c b/pjlib/src/pjlib-test/main_win32.c
index 07d9187..6024a95 100644
--- a/pjlib/src/pjlib-test/main_win32.c
+++ b/pjlib/src/pjlib-test/main_win32.c
@@ -55,7 +55,7 @@
     PJ_UNUSED_ARG(level);
     PJ_UNUSED_ARG(len);
     SendMessage(hwndLog, EM_REPLACESEL, FALSE, 
-		(LPARAM)PJ_STRING_TO_NATIVE(data,wdata));
+		(LPARAM)PJ_STRING_TO_NATIVE(data,wdata,256));
 }