diff --git a/pkgs/development/python-modules/migen/default.nix b/pkgs/development/python-modules/migen/default.nix
index 2df88bddfa45..6b797342da91 100644
--- a/pkgs/development/python-modules/migen/default.nix
+++ b/pkgs/development/python-modules/migen/default.nix
@@ -20,6 +20,11 @@ buildPythonPackage {
     hash = "sha256-gRAvl5cUvrjq4t7htXsDBt4F8MEbHXFZoS0jbhrEs1I=";
   };
 
+  patches = [
+    # Add LOAD_FAST_BORROW to opcode tracer for python 3.14.
+    ./tracer-3.14.patch
+  ];
+
   nativeBuildInputs = [ setuptools ];
 
   propagatedBuildInputs = [ colorama ];
diff --git a/pkgs/development/python-modules/migen/tracer-3.14.patch b/pkgs/development/python-modules/migen/tracer-3.14.patch
new file mode 100644
index 000000000000..6b6f25184bbd
--- /dev/null
+++ b/pkgs/development/python-modules/migen/tracer-3.14.patch
@@ -0,0 +1,10 @@
+--- a/migen/fhdl/tracer.py
++++ b/migen/fhdl/tracer.py
+@@ -38,6 +38,7 @@ _load_build_opcodes = {
+     "BUILD_LIST" : _bytecode_length_version_guard(3),
+     "CACHE" : _bytecode_length_version_guard(3),
+     "COPY" : _bytecode_length_version_guard(3),
++    "LOAD_FAST_BORROW" : _bytecode_length_version_guard(3),
+ }
+
+