1 files changed, 2 insertions, 2 deletions
diff --git a/src/libexpr/value.hh b/src/libexpr/value.hh
index 982582793419..2feb2f9492ca 100644
--- a/src/libexpr/value.hh
+++ b/src/libexpr/value.hh
@@ -22,13 +22,13 @@ typedef enum {
 } ValueType;
 
 
-struct Bindings;
+class Bindings;
 struct Env;
 struct Expr;
 struct ExprLambda;
 struct PrimOp;
 struct PrimOp;
-struct Symbol;
+class Symbol;
 
 
 typedef long NixInt;