diff --git a/protobuf2.spec b/protobuf2.spec
index d9eec23..6e45217 100644
--- a/protobuf2.spec
+++ b/protobuf2.spec
@@ -44,6 +44,7 @@ languages
 Summary:             Protocol Buffers C++ headers and libraries
 Requires:            %{name} = %{version}-%{release} %{name}-compiler = %{version}-%{release}
 Requires:            zlib-devel pkgconfig
+Conflicts:           protobuf-devel
 %description devel
 This package contains Protocol Buffers compiler for all languages and
 C++ headers and libraries