diff --git a/flake.nix b/flake.nix
index 9877028..964683d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -48,7 +48,10 @@
           '';
           installPhase = ''
             mkdir -p $out/bin
-            cp build/release/cargoxx $out/bin/
+            # Codegen since Phase 1a routes every executable through
+            # RUNTIME_OUTPUT_DIRECTORY=${"$"}{CMAKE_BINARY_DIR}/bin, so
+            # the binary lives at build/release/bin/cargoxx.
+            cp build/release/bin/cargoxx $out/bin/
             wrapProgram $out/bin/cargoxx \
               --prefix PATH : ${cargoxxRuntimePath} \
               --set-default NIX_CONFIG ${pkgs.lib.escapeShellArg cargoxxNixConfig}