diff --git a/Makefile b/Makefile
index c31eb29..470270d 100644
--- a/Makefile
+++ b/Makefile
@@ -25,6 +25,7 @@ test:
 check:
 	crystal tool format --check
 	./bin/ameba
+	./scripts/linewidth.sh
 
 install:
 	cp mango $(INSTALL_DIR)/mango
diff --git a/scripts/linewidth.sh b/scripts/linewidth.sh
new file mode 100755
index 0000000..7f76fcb
--- /dev/null
+++ b/scripts/linewidth.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+[ ! -z "$(grep '.\{80\}' --exclude-dir=lib --include="*.cr" -nr --color=always . | tee /dev/tty)" ] \
+	&& echo "The above lines exceed the 80 characters limit" \
+	|| exit 0