diff --git a/src/ex_cmds2.c b/src/ex_cmds2.c
index 051c716..7071794 100644
--- a/src/ex_cmds2.c
+++ b/src/ex_cmds2.c
@@ -916,7 +916,7 @@
 
 	QueryPerformanceCounter(tm);
 	QueryPerformanceFrequency(&fr);
-	tm->QuadPart +=  (double)msec / 1000.0 * (double)fr.QuadPart;
+	tm->QuadPart += (LONGLONG)((double)msec / 1000.0 * (double)fr.QuadPart);
 # else
 	long	    usec;