diff --git a/gmime.spec b/gmime.spec
index d89a96a..9985c00 100644
--- a/gmime.spec
+++ b/gmime.spec
@@ -25,6 +25,9 @@ Patch3: gmime-2.5.8-gpg-error.patch
 %else
 %define buildmono 0
 %endif
+%if 0%{?rhel} >= 6
+%define buildmono 0
+%endif
 
 %if 0%buildmono
 BuildRequires:  mono-devel gtk-sharp2-gapi