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-rw-r--r--src/libstore/nar-accessor.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libstore/nar-accessor.hh b/src/libstore/nar-accessor.hh
index 1903355a236e..2871199de16e 100644
--- a/src/libstore/nar-accessor.hh
+++ b/src/libstore/nar-accessor.hh
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <functional>
+
 #include "fs-accessor.hh"
 
 namespace nix {