--- a/src/bomns.cpp
+++ b/src/bomns.cpp
@@ -432,7 +432,10 @@
       if(g_bShowFps)
       {
         dwFpsTimer = SDL_GetTicks() - dwFpsTimer;
-        nFps = 1000l / dwFpsTimer;
+	if (dwFpsTimer)
+	  nFps = 1000l / dwFpsTimer;
+	else
+	  nFps = 1000l;
       }