diff --git a/src/GEOM_SWIG/geompyDC.py b/src/GEOM_SWIG/geompyDC.py
index 849095d4e..56e0ba3fb 100644
--- a/src/GEOM_SWIG/geompyDC.py
+++ b/src/GEOM_SWIG/geompyDC.py
@@ -277,7 +277,7 @@ class geompyDC(GEOM._objref_GEOM_Gen):
         def addToStudyInFather(self, aFather, aShape, aName):
             # Example: see GEOM_TestAll.py
             try:
-                aSObject = self.AddInStudy(myStudy, aShape, aName, aFather)
+                aSObject = self.AddInStudy(self.myStudy, aShape, aName, aFather)
             except:
                 print "addToStudyInFather() failed"
                 return ""