diff --git a/Source/missiles.cpp b/Source/missiles.cpp
index eb8e49fe6..837344c31 100644
--- a/Source/missiles.cpp
+++ b/Source/missiles.cpp
@@ -526,7 +526,7 @@ bool MoveMissile(Missile &missile, tl::function_ref<bool(Point)> checkTile, bool
 			// skip collision logic if the missile is on a corner between tiles
 			if (pixelsTraveled.deltaY % 16 == 0
 			    && pixelsTraveled.deltaX % 32 == 0
-			    && (pixelsTraveled.deltaY / 16) % 2 != (pixelsTraveled.deltaX / 32) % 2) {
+			    && abs(pixelsTraveled.deltaY / 16) % 2 != abs(pixelsTraveled.deltaX / 32) % 2) {
 				continue;
 			}