diff --git a/usadelndsoc/solver.py b/usadelndsoc/solver.py
index 692a3f8f75d2f6ac28f4b54379e7d4ef0d277b73..38a22a82497123fb9fcbcf895f2fd6421c10fe45 100644
--- a/usadelndsoc/solver.py
+++ b/usadelndsoc/solver.py
@@ -587,7 +587,7 @@ class Result:
 
     @property
     def J(self):
-        return self._core.grad_J(self.Phi).transpose(0, 1, 2, 4, 3)
+        return self._core.grad_J(self.Phi).transpose(0, 1, 2, 4, 3) * (-1 / 8)
 
     @property
     def S(self):