diff --git a/bin/compress b/bin/compress
index 925eee2c37b64244ba8eeeb2778ef4ce48fbb699..de86ca1f693396a3e259c4c386d83b40e3156ce0 100755
--- a/bin/compress
+++ b/bin/compress
@@ -63,6 +63,8 @@ function walk(dir) {
 walk("lib/");
 walk("mode/");
 
+if (!blob) help(false);
+
 if (files.length) {
   console.log("Some speficied files were not found: " +
               files.map(function(a){return a.name;}).join(", "));