diff --git a/flake.nix b/flake.nix
index 0b6ff35f..7cd524c5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -139,7 +139,7 @@
               cargoExtraArgs = "-p indexer_ffi";
               postInstall = ''
                 mkdir -p $out/include
-                cp indexer_ffi/indexer_ffi.h $out/include/
+                cp indexer/ffi/indexer_ffi.h $out/include/
               ''
               + pkgs.lib.optionalString pkgs.stdenv.isDarwin ''
                 install_name_tool -id @rpath/libindexer_ffi.dylib $out/lib/libindexer_ffi.dylib