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-rw-r--r--src/progs/ingenuity/ThreadedLoader.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/progs/ingenuity/ThreadedLoader.h b/src/progs/ingenuity/ThreadedLoader.h
index 54cb7833..4cab4acb 100644
--- a/src/progs/ingenuity/ThreadedLoader.h
+++ b/src/progs/ingenuity/ThreadedLoader.h
@@ -67,7 +67,7 @@ public:
const string& data_base_uri,
const Path& data_path,
MetadataMap engine_data,
- const Path& engine_parent,
+ optional<Path> engine_parent,
optional<const string&> engine_name = optional<const string&>(),
optional<size_t> engine_poly = optional<size_t>());