diff --git a/source/core/rendering/scene/hw_walls.cpp b/source/core/rendering/scene/hw_walls.cpp
index c16d5ef73..2dc9a2bc3 100644
--- a/source/core/rendering/scene/hw_walls.cpp
+++ b/source/core/rendering/scene/hw_walls.cpp
@@ -61,7 +61,7 @@ static walltype* IsOnWall(tspritetype* tspr, int height, DVector2& outpos)
 		// Intentionally include two sided walls. Even on them the sprite should be projected onto the wall for better results.
 		auto d = wal.delta();
 		int walang = getangle(d.X, d.Y);
-		int deltaang = abs(walang - tspr->ang) & 2047;
+		int deltaang = abs((((walang - tspr->ang) & 2047) << 21) >> 21);
 		const int maxangdelta = 1;
 
 		// angle of the sprite must either be the wall's normal or the negative wall's normal to be aligned.