diff --git a/modelx/core/model.py b/modelx/core/model.py
index 1b15e06..4bdefc3 100644
--- a/modelx/core/model.py
+++ b/modelx/core/model.py
@@ -1354,6 +1354,10 @@ def del_macro(self, name):
         macro = self._macros[name]
         macro.on_delete()
         del self._macros[name]
+        
+        # Remove from macro namespace if it exists
+        if self._macro_namespace is not None and name in self._macro_namespace:
+            del self._macro_namespace[name]
     
     def get_macro_namespace(self):
         """Get the namespace for macro execution
diff --git a/modelx/tests/core/model/test_macro.py b/modelx/tests/core/model/test_macro.py
index 9ca5124..91bae24 100644
--- a/modelx/tests/core/model/test_macro.py
+++ b/modelx/tests/core/model/test_macro.py
@@ -143,9 +143,15 @@ def to_delete():
     
     assert 'to_delete' in m.macros
     
+    # Call macro to ensure namespace is created
+    m.to_delete()
+    assert 'to_delete' in m._impl._macro_namespace
+    
     del m.to_delete
     
     assert 'to_delete' not in m.macros
+    # Verify macro is also removed from the namespace (bug fix)
+    assert 'to_delete' not in m._impl._macro_namespace
     with pytest.raises(AttributeError):
         m.to_delete()