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-rw-r--r--src/libexpr/primops.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libexpr/primops.hh b/src/libexpr/primops.hh
index ed5e2ea58..9d42d6539 100644
--- a/src/libexpr/primops.hh
+++ b/src/libexpr/primops.hh
@@ -1,3 +1,5 @@
+#pragma once
+
#include "eval.hh"
#include <tuple>