diff --git a/src/main.c b/src/main.c
index 322f27a..6b5d201 100644
--- a/src/main.c
+++ b/src/main.c
@@ -154,6 +154,9 @@ void castRay(s16 angle, s16 column){
 
   //Wall height calcs
   shortestDist = fix16Mul(dx, shortestDist);
+  if(shortestDist < 0){
+    shortestDist = -shortestDist;
+  }
   fix16 wallHeightFix16 = fix16Div(FIX16(SCREEN_HEIGHT), (shortestDist + FIX16(1)));
   wallHeightFix16 = fix16Mul(wallHeightFix16, WALL_HEIGHT_SCALE);
   int wallHeight = fix16ToInt(wallHeightFix16);