diff --git a/src/libflake/flake/flake.cc b/src/libflake/flake/flake.cc
index 8e381c0d200..9d5760ed116 100644
--- a/src/libflake/flake/flake.cc
+++ b/src/libflake/flake/flake.cc
@@ -638,10 +638,6 @@ LockedFlake lockFlake(
                             nodePaths.emplace(childNode, inputFlake.path.parent());
                             computeLocks(inputFlake.inputs, childNode, inputPath, oldLock, lockRootPath, inputFlake.path, false);
                         } else {
-                            // FIXME: sourcePath is wrong here, we
-                            // should pass a lambda that lazily
-                            // fetches the parent flake if needed
-                            // (i.e. getInputFlake()).
                             computeLocks(fakeInputs, childNode, inputPath, oldLock, lockRootPath, sourcePath, true);
                         }