diff --git a/nix/mkAtmApp.nix b/nix/mkAtmApp.nix
index 68a4c37..272bd33 100644
--- a/nix/mkAtmApp.nix
+++ b/nix/mkAtmApp.nix
@@ -172,6 +172,27 @@ pkgs.stdenv.mkDerivation (finalAttrs: {
     cp -rL "$bcpp_store/node_modules/@serialport/bindings-cpp/prebuilds" $out/node_modules/@serialport/bindings-cpp/prebuilds
     cp "$bcpp_store/node_modules/@serialport/bindings-cpp/package.json" $out/node_modules/@serialport/bindings-cpp/package.json
 
+    # bindings-cpp ships prebuilds for every platform it supports: android,
+    # win32, darwin, and linux for several arches in both glibc and musl. Keep
+    # only the one this system can actually load.
+    #
+    # This is load-bearing on aarch64, not just tidiness. On x86_64 autoPatchelf
+    # skipped the foreign prebuilds because their ELF architecture did not match
+    # the host. On aarch64 the android-arm64 prebuild IS the host architecture,
+    # so autoPatchelf tries to patch it and fails hunting for Android's
+    # liblog.so and libc++_shared.so, which do not exist on NixOS. First Pi
+    # build died exactly there.
+    #
+    # Pruning rather than extending autoPatchelfIgnoreMissingDeps: teaching
+    # autoPatchelf to tolerate a binary we never load, for a platform we do not
+    # target, is the wrong shape of fix. The musl entry in that list below is
+    # the same problem solved the other way, and is now redundant.
+    keep_prebuild=${if pkgs.stdenv.hostPlatform.isAarch64 then "linux-arm64" else "linux-x64"}
+    find $out/node_modules/@serialport/bindings-cpp/prebuilds -mindepth 1 -maxdepth 1 \
+      ! -name "$keep_prebuild" -exec rm -rf {} +
+    rm -f $out/node_modules/@serialport/bindings-cpp/prebuilds/*/*.musl.node
+    echo "serialport prebuilds kept: $(ls $out/node_modules/@serialport/bindings-cpp/prebuilds)/$(ls $out/node_modules/@serialport/bindings-cpp/prebuilds/"$keep_prebuild")"
+
     copy_pnpm_pkg @serialport/bindings-interface $out/node_modules/@serialport/bindings-interface
     copy_pnpm_pkg @serialport/binding-mock $out/node_modules/@serialport/binding-mock