diff --git a/interpreter/NassiShneidermann.py b/interpreter/NassiShneidermann.py
index 1302cd9..df3ce9f 100644
--- a/interpreter/NassiShneidermann.py
+++ b/interpreter/NassiShneidermann.py
@@ -50,7 +50,7 @@ class NassiShneidermanDiagram:
         if os.path.exists(filepath + ".png"):
             if behavoiur == OB.SKIP:
                 return None
-            elif behavoiur == OB.OVERWWRITE:
+            elif behavoiur == OB.OVERWRITE:
                 return filepath
             else:
                 while os.path.exists(filepath+".png"):