diff --git a/raycastlib.h b/raycastlib.h
index 6c2a842..c90db01 100644
--- a/raycastlib.h
+++ b/raycastlib.h
@@ -745,7 +745,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
       p.hit = hit;
 
       if (_computeTextureCoords)
-        p.textureCoordY = UNITS_PER_SQUARE - ((i - z1ScreenNoClamp) *
+        p.textureCoordY = UNITS_PER_SQUARE - 1 -((i - z1ScreenNoClamp) *
           UNITS_PER_SQUARE) / wallScreenHeightNoClamp;
 
       _pixelFunction(p);
@@ -766,7 +766,7 @@ void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
         p.hit = hit;
 
         if (_computeTextureCoords)
-          p.textureCoordY = UNITS_PER_SQUARE - ((i - z1ScreenCeilNoClamp) *
+          p.textureCoordY = UNITS_PER_SQUARE - 1 - ((i - z1ScreenCeilNoClamp) *
             UNITS_PER_SQUARE) / wallScreenHeightCeilNoClamp;
 
         _pixelFunction(p);