diff --git a/include/osg/Referenced b/include/osg/Referenced
index f851f3dbf..782b9347e 100644
--- a/include/osg/Referenced
+++ b/include/osg/Referenced
@@ -121,7 +121,7 @@ class OSG_EXPORT Referenced
 #if defined(_OSG_REFERENCED_USE_ATOMIC_OPERATIONS)
         struct ObserverSetData;
 
-        mutable OpenThreads::AtomicPtr _observerSetDataPtr;
+        mutable OpenThreads::AtomicPtr  _observerSetDataPtr;
 
         mutable OpenThreads::Atomic     _refCount;
 #else