diff --git a/check_prereq b/check_prereq
index 76112c2..81ed859 100755
--- a/check_prereq
+++ b/check_prereq
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+exit_code=0
 prereqs=(
 	"bash"
 	"flock"
@@ -17,5 +18,7 @@ for prereq in "${prereqs[@]}"; do
 	echo -n "$prereq: "
 	if ! command -v "$prereq"; then
 		echo "NOT FOUND."
+		exit_code=1
 	fi
-done
\ No newline at end of file
+done
+exit $exit_code
\ No newline at end of file