diff --git a/src/msw/font.cpp b/src/msw/font.cpp
index 918e7c06d2..c1d032c476 100644
--- a/src/msw/font.cpp
+++ b/src/msw/font.cpp
@@ -635,7 +635,7 @@ wxString wxNativeFontInfo::ToString() const
 {
     wxString s;
 
-    s.Printf(_T("%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%s"),
+    s.Printf(_T("%d;%ld;%ld;%ld;%ld;%ld;%d;%d;%d;%d;%d;%d;%d;%d;%s"),
              0, // version, in case we want to change the format later
              lf.lfHeight,
              lf.lfWidth,