diff --git a/pydoctor/model.py b/pydoctor/model.py
index eeac34b10..c59e1ff6f 100644
--- a/pydoctor/model.py
+++ b/pydoctor/model.py
@@ -685,7 +685,7 @@ def compute_mros(self) -> None:
             if cls in self.computed_mros:
                 continue
             # All strings bases are already pre-computed to the empty list, 
-            # so the cls varible must be a Class at this point
+            # so the cls variable must be a Class at this point
             assert isinstance(cls, Class)
             self.computed_mros[cls] = cls._mro = self._compute_mro(cls)