diff --git a/src/semver b/src/semver
index a160425..a800079 100755
--- a/src/semver
+++ b/src/semver
@@ -431,7 +431,7 @@ function command_validate {
 }
 
 case $# in
-  0) echo "Unknown command: $*"; usage_help;;
+  0) echo "$USAGE"; exit 0;;
 esac
 
 case $1 in