diff --git a/src/libexpr/flake/call-flake.nix b/src/libexpr/flake/call-flake.nix
index 43ecb7f156f..38dc74ba135 100644
--- a/src/libexpr/flake/call-flake.nix
+++ b/src/libexpr/flake/call-flake.nix
@@ -47,7 +47,7 @@ let
             else if node.locked.type == "path" && builtins.substring 0 1 node.locked.path != "/"
             then
               parentNode.sourceInfo // {
-                outPath = parentNode.sourceInfo.outPath + ("/" + node.locked.path);
+                outPath = parentNode.outPath + ("/" + node.locked.path);
               }
             else
               # FIXME: remove obsolete node.info.
diff --git a/tests/functional/flakes/relative-paths.sh b/tests/functional/flakes/relative-paths.sh
index cecda44d4bc..38987d6afb1 100644
--- a/tests/functional/flakes/relative-paths.sh
+++ b/tests/functional/flakes/relative-paths.sh
@@ -63,6 +63,10 @@ git -C $rootFlake add flake.nix sub2/flake.nix
 
 [[ $(nix eval $subflake2#y) = 15 ]]
 
+# Make sure that this still works after commiting the lock file.
+git -C $rootFlake add sub2/flake.lock
+[[ $(nix eval $subflake2#y) = 15 ]]
+
 # Make sure there are no content locks for relative path flakes.
 (! grep "$TEST_ROOT" $subflake2/flake.lock)
 (! grep "$NIX_STORE_DIR" $subflake2/flake.lock)