diff --git a/qpid-proton.spec b/qpid-proton.spec
index 7bdeebc..7214a71 100644
--- a/qpid-proton.spec
+++ b/qpid-proton.spec
@@ -285,9 +285,11 @@ Requires:  qpid-proton-c = %{version}-%{release}
 
 CXX11FLAG="-std=c++11"
 
+%if 0%{?rhel} 
 %if 0%{?rhel} <= 6
 CXX11FLAG=""
 %endif
+%endif
 
 %if 0%{?fedora}
 %cmake \