diff --git a/Makefile b/Makefile
index dc986f4..7e09fd3 100644
--- a/Makefile
+++ b/Makefile
@@ -9,8 +9,8 @@ images-dir:
 	mkdir -p $(OUT_IMGS)
 
 images-birds: build/seam-carving images-dir
-	$(BIN) -s $(IN_IMGS)/birds.jpg -m $(IN_IMGS)/birds-mask.jpg -o $(OUT_IMGS)/vertical-birds.jpg   -u --vertical
-	$(BIN) -s $(IN_IMGS)/birds.jpg -m $(IN_IMGS)/birds-mask.jpg -o $(OUT_IMGS)/horizontal-birds.jpg -u
+	$(BIN) -s $(IN_IMGS)/birds.jpg -m $(IN_IMGS)/birds-mask.jpg -o $(OUT_IMGS)/birds-vertical.jpg   -u --vertical
+	$(BIN) -s $(IN_IMGS)/birds.jpg -m $(IN_IMGS)/birds-mask.jpg -o $(OUT_IMGS)/birds-horizontal.jpg -u
 
 images-ign: build/seam-carving images-dir
 	$(BIN) -s $(IN_IMGS)/ign-circled.png -m $(IN_IMGS)/ign-mask.jpg -o $(OUT_IMGS)/ign-maxstep3-seams.jpg -u --max-step 3 --show-seams