diff --git a/src/profiler.c b/src/profiler.c
index 780b958..504d713 100644
--- a/src/profiler.c
+++ b/src/profiler.c
@@ -287,11 +287,13 @@
 profile_cmp(const proftime_T *tm1, const proftime_T *tm2)
 {
 # ifdef MSWIN
-    return (int)(tm2->QuadPart - tm1->QuadPart);
+    return tm2->QuadPart == tm1->QuadPart ? 0 :
+	tm2->QuadPart > tm1->QuadPart ? 1 : -1;
 # else
     if (tm1->tv_sec == tm2->tv_sec)
-	return tm2->tv_fsec - tm1->tv_fsec;
-    return tm2->tv_sec - tm1->tv_sec;
+	return tm2->tv_fsec == tm1->tv_fsec ? 0 :
+	    tm2->tv_fsec > tm1->tv_fsec ? 1 : -1;
+    return tm2->tv_sec > tm1->tv_sec ? 1 : -1;
 # endif
 }