fix gcc-normal compiler warnings, no object change

Signed-off-by: Thomas E. Dickey <dickey@invisible-island.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/twm.h b/src/twm.h
index 8fe2555..6e1e17c 100644
--- a/src/twm.h
+++ b/src/twm.h
@@ -212,8 +212,8 @@ typedef struct Colormaps
     char *scoreboard;		/* conflicts between installable colortables */
 } Colormaps;
 
-#define ColormapsScoreboardLength(cm) ((cm)->number_cwins * \
-				       ((cm)->number_cwins - 1) / 2)
+#define ColormapsScoreboardLength(cm) (size_t)((cm)->number_cwins * \
+					       ((cm)->number_cwins - 1) / 2)
 
 /* for each window that is on the display, one of these structures
  * is allocated and linked into a list