diff --git a/source/duke3d/src/game.h b/source/duke3d/src/game.h
index 5161c0a2b..510c72113 100644
--- a/source/duke3d/src/game.h
+++ b/source/duke3d/src/game.h
@@ -341,7 +341,7 @@ extern palette_t CrosshairColors;
 extern palette_t DefaultCrosshairColors;
 
 extern double g_frameDelay;
-static inline double calcFrameDelay(int maxFPS) { return maxFPS ? ((double)timerGetFreqU64() / (double)(maxFPS)) : 0.0; }
+static inline double calcFrameDelay(int maxFPS) { return maxFPS > 0 ? ((double)timerGetFreqU64() / (double)(maxFPS)) : 0.0; }
 
 int32_t A_CheckInventorySprite(spritetype *s);
 int32_t A_InsertSprite(int16_t whatsect, int32_t s_x, int32_t s_y, int32_t s_z, int16_t s_pn, int8_t s_s, uint8_t s_xr,