diff --git a/engines/hdb/ai.h b/engines/hdb/ai.h
index 44e4f69807e..7c7c28e725a 100644
--- a/engines/hdb/ai.h
+++ b/engines/hdb/ai.h
@@ -418,13 +418,13 @@ struct AIEntity {
 
 	union {
 		uint16 blinkFrames;
-		uint16 int1;
+		int16 int1;
 	};
 	Tile *blinkGfx[kMaxAnimFrames];
 
 	union {
 		uint16 special1Frames;
-		uint16 int2;
+		int16 int2;
 	};
 	Tile *special1Gfx[kMaxAnimFrames];