diff --git a/pkgs/by-name/si/signal-desktop/libsignal-node.nix b/pkgs/by-name/si/signal-desktop/libsignal-node.nix
index bf3b6ecf3536..b3b13c42c954 100644
--- a/pkgs/by-name/si/signal-desktop/libsignal-node.nix
+++ b/pkgs/by-name/si/signal-desktop/libsignal-node.nix
@@ -70,7 +70,9 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
     substituteInPlace node/build_node_bridge.py \
       --replace-fail "dst_base = 'libsignal_client_%s_%s' % (node_os_name, node_arch)" \
-                     "dst_base = '@signalapp+libsignal-client'"
+                     "dst_base = '@signalapp+libsignal-client'" \
+      --replace-fail "objcopy = shutil.which('%s-linux-gnu-objcopy' % cargo_target.split('-')[0]) or 'objcopy'" \
+                     "objcopy = os.getenv('OBJCOPY', 'objcopy')"
   '';
 
   buildPhase = ''