diff --git a/src/osg/State.cpp b/src/osg/State.cpp
index 5f52f8034..f8dc4d8a6 100644
--- a/src/osg/State.cpp
+++ b/src/osg/State.cpp
@@ -1843,6 +1843,7 @@ bool State::DefineMap::updateCurrentDefines()
                 }
             }
         }
+        changed = false;
         return true;
     }
     else