diff --git a/uglify-js.spec b/uglify-js.spec
index 34bdab6..7709140 100644
--- a/uglify-js.spec
+++ b/uglify-js.spec
@@ -38,6 +38,7 @@ BuildRequires:  web-assets-devel
 
 %if 0%{?enable_tests}
 BuildRequires:  npm(async)
+BuildRequires:  npm(mocha)
 BuildRequires:  npm(optimist)
 BuildRequires:  npm(source-map)
 %endif