diff --git a/DetectorDescription/RegionSelector/python/RegSelConfig.py b/DetectorDescription/RegionSelector/python/RegSelConfig.py
index ad732614900ec4475a18abe5f6f7ded8c0598ccf..506891c1881eaa92df836be860c5635b511e3542 100644
--- a/DetectorDescription/RegionSelector/python/RegSelConfig.py
+++ b/DetectorDescription/RegionSelector/python/RegSelConfig.py
@@ -165,7 +165,7 @@ if __name__ == "__main__":
 
     cfg.getService("IOVDbSvc").OutputLevel=DEBUG
     
-    cfg.store( file( "test.pkl", "wb" ) )
+    cfg.store( open( "test.pkl", "wb" ) )
     print("used flags")
     ConfigFlags.dump()
     cfg.run(0)
diff --git a/Simulation/G4Atlas/G4AtlasServices/test/G4AtlasServicesConfig_test.py b/Simulation/G4Atlas/G4AtlasServices/test/G4AtlasServicesConfig_test.py
index a15b67aa6d1e6f3df05972c0f7a014e15ac71c8b..58f97be22900c9adf1bce2dee0c672f204b33ee0 100755
--- a/Simulation/G4Atlas/G4AtlasServices/test/G4AtlasServicesConfig_test.py
+++ b/Simulation/G4Atlas/G4AtlasServices/test/G4AtlasServicesConfig_test.py
@@ -55,7 +55,7 @@ if __name__ == '__main__':
   ConfigFlags.dump()
 
 
-  f=open("test.pkl","w")
+  f=open("test.pkl","wb")
   cfg.store(f) 
   f.close()