diff --git a/reactos/base/applications/charmap/map.c b/reactos/base/applications/charmap/map.c
index b47dab36c40..2a3c80df46e 100644
--- a/reactos/base/applications/charmap/map.c
+++ b/reactos/base/applications/charmap/map.c
@@ -487,7 +487,7 @@ OnPaint(PMAP infoPtr,
         {
             return;
         }
-        hdc = (HDC)wParam;
+        ps.hdc = (HDC)wParam;
     }
     else
     {