diff --git a/src/osg/State.cpp b/src/osg/State.cpp
index 0d46f6aaf..abd0ddb90 100644
--- a/src/osg/State.cpp
+++ b/src/osg/State.cpp
@@ -1842,6 +1842,7 @@ bool State::DefineMap::updateCurrentDefines()
                 }
             }
         }
+        changed = false;
         return true;
     }
     else