diff --git a/core/src/main/resources/shaders/fog/fog.frag b/core/src/main/resources/shaders/fog/fog.frag
index a4495bd82..d4982674d 100644
--- a/core/src/main/resources/shaders/fog/fog.frag
+++ b/core/src/main/resources/shaders/fog/fog.frag
@@ -255,7 +255,7 @@ float calculateHeightFogDepth(float worldYPos)
     else
     {
         // shouldn't happen,
-        return 0;
+        return 0.0;
     }
 
 }