diff --git a/src/compress.c b/src/compress.c
index 0727c1a..23f11d0 100644
--- a/src/compress.c
+++ b/src/compress.c
@@ -69,6 +69,9 @@ void addPixelToSelectedZone(Image *t_img, int64_t t_idx, Zone *t_zone) {
   for (; left_limit <= right_limit; ++left_limit) {
     addPixelToSelectedZone(t_img, t_idx + t_img->sizeX, t_zone);
   }
+  for (; left_limit <= right_limit; ++left_limit) {
+    addPixelToSelectedZone(t_img, t_idx - t_img->sizeX, t_zone);
+  }
 }
 
 /**