diff --git a/pkgs/build-support/rust/patch-registry-deps/pkg-config b/pkgs/build-support/rust/patch-registry-deps/pkg-config
index 2acf489851e..fbb09430458 100644
--- a/pkgs/build-support/rust/patch-registry-deps/pkg-config
+++ b/pkgs/build-support/rust/patch-registry-deps/pkg-config
@@ -4,5 +4,5 @@ for dir in pkg-config-*; do
     echo "Patching pkg-config registry dep"
 
     substituteInPlace "$dir/src/lib.rs" \
-        --replace '"/usr"' '"/nix/store/"'
+        --replace '"/usr"' '"'"$NIX_STORE"'/"'
 done