diff --git a/MDANSE/Src/MDANSE/MolecularDynamics/Trajectory.py b/MDANSE/Src/MDANSE/MolecularDynamics/Trajectory.py
index 087d7fd9db..2e81a9d236 100644
--- a/MDANSE/Src/MDANSE/MolecularDynamics/Trajectory.py
+++ b/MDANSE/Src/MDANSE/MolecularDynamics/Trajectory.py
@@ -391,9 +391,9 @@ def has_variable(self, variable: str) -> bool:
             True if variable exists.
         """
         if variable in self._h5_file["/configuration"]:
-            return False
-        else:
             return True
+        else:
+            return False
 
     @property
     def chemical_system(self):