diff --git a/gambit-c.spec b/gambit-c.spec
index 43cdd94..847e645 100644
--- a/gambit-c.spec
+++ b/gambit-c.spec
@@ -14,7 +14,7 @@
 
 Name:           gambit-c
 Version:        4.6.6
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Scheme programming system
 
 Group:          Development/Languages
@@ -184,6 +184,9 @@ fi
 
 
 %changelog
+* Sat Aug 03 2013 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 4.6.6-4
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_20_Mass_Rebuild
+
 * Wed Feb 13 2013 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 4.6.6-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_19_Mass_Rebuild