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-rw-r--r--src/libexpr/value.hh5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/libexpr/value.hh b/src/libexpr/value.hh
index 048522016c62..271e6a1b24a2 100644
--- a/src/libexpr/value.hh
+++ b/src/libexpr/value.hh
@@ -1,7 +1,12 @@
 #pragma once
 
+#include "config.h"
 #include "symbol-table.hh"
 
+#if HAVE_BOEHMGC
+#include <gc/gc_allocator.h>
+#endif
+
 namespace nix {