diff --git a/perl-Test-Differences.spec b/perl-Test-Differences.spec
index 29c6772..009a280 100644
--- a/perl-Test-Differences.spec
+++ b/perl-Test-Differences.spec
@@ -4,7 +4,7 @@
 
 Name:           perl-Test-Differences
 Version:        %{RPM_version}
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Test strings and data structures and show differences if not OK
 
 Group:          Development/Libraries
@@ -19,6 +19,8 @@ BuildRequires:  perl(ExtUtils::MakeMaker)
 BuildRequires:  perl(Test::More)
 BuildRequires:  perl(Test::Pod)
 BuildRequires:  perl(Test::Pod::Coverage)
+# not detected
+Requires:       perl(Text::Diff) >= 0.35
 Requires:       perl(:MODULE_COMPAT_%(eval "`%{__perl} -V:version`"; echo $version))
 
 %description
@@ -60,6 +62,9 @@ rm -rf $RPM_BUILD_ROOT
 
 
 %changelog
+* Thu Jul 08 2010 Iain Arnell <iarnell@gmail.com> 0.500-2
+- explicitly require perl(Text::Diff)
+
 * Tue Jun 29 2010 Paul Howarth <paul@city-fan.org> - 0.5000-1
 - Update to 0.500
   - Add support for all diff styles supplied by Text::Diff (CPAN RT#23579)