diff --git a/rubygem-test-unit.spec b/rubygem-test-unit.spec
index a4c97df..14efae2 100644
--- a/rubygem-test-unit.spec
+++ b/rubygem-test-unit.spec
@@ -26,6 +26,7 @@ BuildRequires:	rubygem(power_assert)
 # For %%check
 #BuildRequires:	rubygem(rake)
 #BuildRequires:	rubygem(hoe)
+BuildRequires:	rubygem(bigdecimal)
 Requires:	ruby(release)
 Requires:	rubygems