diff --git a/torchmdnet/datasets/qm9q.py b/torchmdnet/datasets/qm9q.py
index 25c888a74..d41755ef2 100644
--- a/torchmdnet/datasets/qm9q.py
+++ b/torchmdnet/datasets/qm9q.py
@@ -145,7 +145,7 @@ def sample_iter(self):
                         == "vector : Hartree/Bohr "
                     )
                     dy = (
-                        pt.tensor(mol["gradient_vector"][conf], dtype=pt.float32)
+                        -pt.tensor(mol["gradient_vector"][conf], dtype=pt.float32)
                         * self.HARTREE_TO_EV
                         / self.BORH_TO_ANGSTROM
                     )
diff --git a/torchmdnet/datasets/spice.py b/torchmdnet/datasets/spice.py
index 3bda70c20..6bc52f8db 100644
--- a/torchmdnet/datasets/spice.py
+++ b/torchmdnet/datasets/spice.py
@@ -97,7 +97,7 @@ def sample_iter(self):
                 * self.HARTREE_TO_EV
             )
             all_dy = (
-                pt.tensor(mol["dft_total_gradient"], dtype=pt.float32)
+                -pt.tensor(mol["dft_total_gradient"], dtype=pt.float32)
                 * self.HARTREE_TO_EV
                 / self.BORH_TO_ANGSTROM
             )