diff --git a/pkgs/applications/radio/gnuradio/3.9.nix b/pkgs/applications/radio/gnuradio/3.9.nix
index 4d10851b7e13..62ee880ce2be 100644
--- a/pkgs/applications/radio/gnuradio/3.9.nix
+++ b/pkgs/applications/radio/gnuradio/3.9.nix
@@ -276,7 +276,7 @@ stdenv.mkDerivation (finalAttrs: (shared // {
   '';
   patches = [
     # Not accepted upstream, see https://github.com/gnuradio/gnuradio/pull/5227
-    ./modtool-newmod-permissions.patch
+    ./modtool-newmod-permissions.3_9.patch
   ];
   passthru = shared.passthru // {
     # Deps that are potentially overridden and are used inside GR plugins - the same version must
diff --git a/pkgs/applications/radio/gnuradio/modtool-newmod-permissions.3_9.patch b/pkgs/applications/radio/gnuradio/modtool-newmod-permissions.3_9.patch
new file mode 100644
index 000000000000..7cab73fede0c
--- /dev/null
+++ b/pkgs/applications/radio/gnuradio/modtool-newmod-permissions.3_9.patch
@@ -0,0 +1,15 @@
+diff --git c/gr-utils/modtool/core/newmod.py w/gr-utils/modtool/core/newmod.py
+index babebfcde..9a02f663e 100644
+--- c/gr-utils/modtool/core/newmod.py
++++ w/gr-utils/modtool/core/newmod.py
+@@ -62,7 +62,9 @@ class ModToolNewModule(ModTool):
+         self._setup_scm(mode='new')
+         logger.info(f"Creating out-of-tree module in {self.dir}...")
+         try:
+-            shutil.copytree(self.srcdir, self.dir)
++            # https://stackoverflow.com/a/17022146/4935114
++            shutil.copystat = lambda x, y: x
++            shutil.copytree(self.srcdir, self.dir, copy_function=shutil.copyfile)
+             try:
+               shutil.copyfile(os.path.join(gr.prefix(), 'share', 'gnuradio', 'clang-format.conf'),
+                               os.path.join(self.dir, '.clang-format'))