diff --git a/pytorch_finufft/functional.py b/pytorch_finufft/functional.py
index f14287c..479959f 100644
--- a/pytorch_finufft/functional.py
+++ b/pytorch_finufft/functional.py
@@ -78,18 +78,12 @@ def forward(  # type: ignore[override]
         points: torch.Tensor,
         values: torch.Tensor,
         output_shape: Union[int, Tuple[int, int], Tuple[int, int, int]],
-        out: Optional[torch.Tensor] = None,
         finufftkwargs: Optional[Dict[str, Union[int, float]]] = None,
     ) -> torch.Tensor:
         """
         Evaluates the Type 1 NUFFT on the inputs.
         """
 
-        if out is not None:
-            # All this requires is a check on the out array to make sure it is the
-            # correct shape.
-            raise NotImplementedError("In-place results are not yet implemented")
-
         checks.check_devices(values, points)
         checks.check_dtypes(values, points, "Values")
         checks.check_sizes_t1(values, points)
@@ -197,7 +191,6 @@ def forward(  # type: ignore[override]
         ctx: Any,
         points: torch.Tensor,
         targets: torch.Tensor,
-        out: Optional[torch.Tensor] = None,
         finufftkwargs: Optional[Dict[str, Union[int, float]]] = None,
     ) -> torch.Tensor:
         """
@@ -230,10 +223,6 @@ def forward(  # type: ignore[override]
         ------
 
         """
-
-        if out is not None:
-            raise NotImplementedError("In-place results are not yet implemented")
-
         checks.check_devices(targets, points)
         checks.check_dtypes(targets, points, "Targets")
         checks.check_sizes_t2(targets, points)
diff --git a/tests/test_1d/test_backward_1d.py b/tests/test_1d/test_backward_1d.py
index b4918bd..9753ad3 100644
--- a/tests/test_1d/test_backward_1d.py
+++ b/tests/test_1d/test_backward_1d.py
@@ -47,7 +47,6 @@ def func(points, values):
             points,
             values,
             (N + modifier,),
-            None,
             dict(modeord=int(not fftshift), isign=isign),
         )
 
@@ -114,7 +113,6 @@ def func(points, targets):
         return pytorch_finufft.functional.finufft_type2.apply(
             points,
             targets,
-            None,
             dict(modeord=int(not fftshift), isign=isign),
         )
 
diff --git a/tests/test_2d/test_backward_2d.py b/tests/test_2d/test_backward_2d.py
index f76a918..687ce67 100644
--- a/tests/test_2d/test_backward_2d.py
+++ b/tests/test_2d/test_backward_2d.py
@@ -58,7 +58,6 @@ def func(points, values):
             points,
             values,
             (N, N + modifier),
-            None,
             dict(modeord=int(not fftshift), isign=isign),
         )
 
@@ -125,7 +124,6 @@ def func(points, targets):
         return pytorch_finufft.functional.finufft_type2.apply(
             points,
             targets,
-            None,
             dict(modeord=int(not fftshift), isign=isign),
         )
 
diff --git a/tests/test_2d/test_forward_2d.py b/tests/test_2d/test_forward_2d.py
index 52a32c4..c8f7640 100644
--- a/tests/test_2d/test_forward_2d.py
+++ b/tests/test_2d/test_forward_2d.py
@@ -82,7 +82,6 @@ def test_t2_forward_CPU(N: int, fftshift: bool) -> None:
     finufft_out = pytorch_finufft.functional.finufft_type2.apply(
         points,
         targets,
-        None,
         {"modeord": int(not fftshift)},
     )
 
diff --git a/tests/test_3d/test_backward_3d.py b/tests/test_3d/test_backward_3d.py
index 4e21d80..3eb324d 100644
--- a/tests/test_3d/test_backward_3d.py
+++ b/tests/test_3d/test_backward_3d.py
@@ -50,7 +50,6 @@ def func(points, values):
             points,
             values,
             (N, N + modifier, N + 2 * modifier),
-            None,
             dict(modeord=int(not fftshift), isign=isign),
         )
 
@@ -122,7 +121,6 @@ def func(points, targets):
         return pytorch_finufft.functional.finufft_type2.apply(
             points,
             targets,
-            None,
             dict(modeord=int(not fftshift), isign=isign),
         )