diff --git a/img/img_patch.m b/img/img_patch.m
index b3918ff7..e46c4bee 100644
--- a/img/img_patch.m
+++ b/img/img_patch.m
@@ -56,7 +56,7 @@
 else
     
     % All coordinates are integers
-    if sum(round(bb)-bb)==0
+    if sum(abs(round(bb)-bb))==0
         L = max([1 bb(1)]);
         T = max([1 bb(2)]);
         R = min([size(img,2) bb(3)]);