diff --git a/src/osg/State.cpp b/src/osg/State.cpp
index 0cd80d670..030a57e5c 100644
--- a/src/osg/State.cpp
+++ b/src/osg/State.cpp
@@ -1621,7 +1621,7 @@ std::string State::getDefineString(const osg::ShaderDefines& shaderDefines)
             shaderDefineStr += cd_itr->first;
             if (!dp.first.empty())
             {
-                shaderDefineStr += " ";
+                if (dp.first[0]!='(') shaderDefineStr += " ";
                 shaderDefineStr += dp.first;
             }
 #ifdef WIN32