diff --git a/External/CheckerGccPlugins/src/gaudi_inheritance_plugin.cxx b/External/CheckerGccPlugins/src/gaudi_inheritance_plugin.cxx
index c152448145ad23d9852ffe5ef4b83e50005ed571..40c08cb6fb32ca9c1d43145942c55d183d919fd4 100644
--- a/External/CheckerGccPlugins/src/gaudi_inheritance_plugin.cxx
+++ b/External/CheckerGccPlugins/src/gaudi_inheritance_plugin.cxx
@@ -73,6 +73,7 @@ void type_callback (void* gcc_data, void* /*user_data*/)
   // Core classes for which we should skip this test.
   std::string name = type_name(tt);
   if (name == "AthAlgorithm" ||
+      name == "AthReentrantAlgorithm" ||
       name == "AthAlgTool" ||
       name == "AthService" ||
       name == "SegMemSvc" ||
diff --git a/External/CheckerGccPlugins/src/usingns_plugin.cxx b/External/CheckerGccPlugins/src/usingns_plugin.cxx
index e2ed77dc6d8d7e9553d42cf551e352827ed212cd..d0c4209c5195e06cd1e5648b46f1d40414ec9286 100644
--- a/External/CheckerGccPlugins/src/usingns_plugin.cxx
+++ b/External/CheckerGccPlugins/src/usingns_plugin.cxx
@@ -199,6 +199,7 @@ void handle_using_decl (tree /*decl*/)
 
     // using decls from g4
     if (strendswith_p (file, "/G4SystemOfUnits.hh")) return;
+    if (strendswith_p (file, "/G4PhysicalConstants.hh")) return;
     if (strendswith_p (file, "/G4RadioactivityTable.hh")) return;