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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 9fe3878916d5..a314e01e0a71 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -81,7 +81,7 @@ public:
 
     /* The allowed filesystem paths in restricted or pure evaluation
        mode. */
-    std::experimental::optional<PathSet> allowedPaths;
+    std::optional<PathSet> allowedPaths;
 
     Value vEmptySet;