diff --git a/engines/scumm/he/moonbase/moonbase.h b/engines/scumm/he/moonbase/moonbase.h
index 966112dbbd5c..6b0d2e0d0d58 100644
--- a/engines/scumm/he/moonbase/moonbase.h
+++ b/engines/scumm/he/moonbase/moonbase.h
@@ -65,8 +65,8 @@ class Moonbase {
 	int _fowAnimationFrames;
 	int _fowCurrentFOWFrame;
 
-	int _fowTileW;
-	int _fowTileH;
+	int32 _fowTileW;
+	int32 _fowTileH;
 
 	uint8 *_fowImage;
 	int _fowClipX1;