diff --git a/src/r_patchrotation.c b/src/r_patchrotation.c
index a9b4a2b8f..dae3a7b53 100644
--- a/src/r_patchrotation.c
+++ b/src/r_patchrotation.c
@@ -227,8 +227,8 @@ void RotatedPatch_DoRotation(rotsprite_t *rotsprite, patch_t *patch, INT32 angle
 
 	ox = (newwidth / 2) + (leftoffset - xpivot);
 	oy = (newheight / 2) + (patch->topoffset - ypivot);
-	width = (maxx - minx);
-	height = (maxy - miny);
+	width = (maxx+1 - minx);
+	height = (maxy+1 - miny);
 
 	if ((unsigned)(width * height) != size)
 	{