diff --git a/src/libexpr/value.hh b/src/libexpr/value.hh
index 885621cf5..335801b34 100644
--- a/src/libexpr/value.hh
+++ b/src/libexpr/value.hh
@@ -159,7 +159,7 @@ public:
     iterator begin() { return &elems[0]; }
     iterator end() { return &elems[size]; }
 
-    friend class Value;
+    friend struct Value;
 };