diff --git a/usadelndsoc/solver.py b/usadelndsoc/solver.py
index 22e933713df93e9e5727dab867ea3b86c8659d33..22f82660c2b555329418e41a21e893a9f18efa91 100644
--- a/usadelndsoc/solver.py
+++ b/usadelndsoc/solver.py
@@ -597,7 +597,7 @@ class Result:
 
     @property
     def J(self):
-        return self._core.grad_A(self.Phi).transpose(0, 1, 2, 4, 3) * (-1 / 16)
+        return self._core.grad_A(self.Phi).transpose(0, 1, 2, 4, 3) * (1 / 16)
 
     @property
     def S(self):