diff --git a/controls/edit.c b/controls/edit.c
index 5920bf4..0e2a1f4 100644
--- a/controls/edit.c
+++ b/controls/edit.c
@@ -361,6 +361,7 @@
         OSVERSIONINFOW info;
         DWORD dwProcVersion = GetProcessVersion(0);
 
+	info.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
         GetVersionExW( &info );
         dwEmulatedVersion = MAKELONG( info.dwMinorVersion, info.dwMajorVersion );
         /* fixme: this may not be 100% correct; see discussion on the