diff --git a/src/libCom/cxxTemplates/epicsSingleton.h b/src/libCom/cxxTemplates/epicsSingleton.h
index da47a9763..ed488aff9 100644
--- a/src/libCom/cxxTemplates/epicsSingleton.h
+++ b/src/libCom/cxxTemplates/epicsSingleton.h
@@ -104,7 +104,7 @@ inline epicsSingleton<TYPE>::~epicsSingleton ()
     // sorts of problems then clean up is left to other classes.
 }
 
-#if defined ( __SUNPRO_CC ) && __SUNPRO_CC <= 0x550
+#if defined ( __SUNPRO_CC ) && __SUNPRO_CC < 0x550
     // SUN PRO 5.4 generates bogus warnings unless it sees an implementation
     template < class TYPE >
     inline epicsSingleton<TYPE>::epicsSingleton ( const epicsSingleton & )