diff --git a/rubygem-json.spec b/rubygem-json.spec
index 4b69c02..4267587 100644
--- a/rubygem-json.spec
+++ b/rubygem-json.spec
@@ -18,6 +18,7 @@ BuildRequires:  rubygems-devel
 BuildRequires:  rubygem(rake)
 BuildRequires:	rubygem(minitest4)
 BuildRequires:	rubygem(bigdecimal)
+BuildRequires:	rubygem(test-unit)
 
 Obsoletes:	rubygem-%{gem_name}-gui < %{version}
 Obsoletes:	ruby-%{gem_name}-gui < %{version}