diff --git a/graph_net/torch/backend/unstable_to_stable_backend.py b/graph_net/torch/backend/unstable_to_stable_backend.py
index 472e43432..49cadfb3d 100644
--- a/graph_net/torch/backend/unstable_to_stable_backend.py
+++ b/graph_net/torch/backend/unstable_to_stable_backend.py
@@ -104,6 +104,28 @@ def _impl_unstable_to_stable_rfft(self, gm):
 
         return gm
 
+    def _impl_unstable_to_stable_fftn(self, gm):
+        """
+        Convert torch._C._fft.fft_fftn to torch.fft.fftn
+        """
+        # Update graph nodes: replace torch._C._fft.fft_fftn with torch.fft.fftn
+        issue_nodes = (
+            node
+            for node in gm.graph.nodes
+            if node.op == "call_function"
+            if hasattr(node.target, "__module__")
+            if node.target.__module__ == "torch._C._fft"
+            if hasattr(node.target, "__name__")
+            if node.target.__name__ == "fft_fftn"
+        )
+        for node in issue_nodes:
+            node.target = torch.fft.fftn
+
+        # Recompile the graph
+        gm.recompile()
+
+        return gm
+
     def unstable_to_stable(self, gm):
         methods = (
             name
diff --git a/graph_net/torch/fx_graph_serialize_util.py b/graph_net/torch/fx_graph_serialize_util.py
index 51b0b6616..f89716d53 100644
--- a/graph_net/torch/fx_graph_serialize_util.py
+++ b/graph_net/torch/fx_graph_serialize_util.py
@@ -23,6 +23,7 @@ def serialize_graph_module_to_str(gm: torch.fx.GraphModule) -> str:
         (r"torch\._C\._nn\.avg_pool2d\(", "torch.nn.functional.avg_pool2d("),
         (r"torch\._C\._fft\.fft_irfft\(", "torch.fft.irfft("),
         (r"torch\._C\._fft\.fft_rfft\(", "torch.fft.rfft("),
+        (r"torch\._C\._fft\.fft_fftn\(", "torch.fft.fftn("),
         # Add new rules to this list as needed
     ]
     for pattern, repl in replacements: