diff --git a/gammapy/maps/geom.py b/gammapy/maps/geom.py
index e2f7627bae..5b068d3c18 100644
--- a/gammapy/maps/geom.py
+++ b/gammapy/maps/geom.py
@@ -390,7 +390,7 @@ def __ne__(self, other):
         return not self.__eq__(other)
 
     def __hash__(self):
-        return hash(self.name)
+        return hash((self._nodes.tostring(), self._node_type, self._name))
 
     @property
     def interp(self):