2 files changed, 2 insertions, 2 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 96bda43a3..e55f28822 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -39,7 +39,7 @@ std::ostream & operator << (std::ostream & str, const Value & v)
         str << v.path; // !!! escaping?
         break;
     case tNull:
-        str << "true";
+        str << "null";
         break;
     case tAttrs: {
         str << "{ ";
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 03bf43a3b..c7533479a 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -5,6 +5,7 @@
 
 #include "nixexpr.hh"
 #include "symbol-table.hh"
+#include "hash.hh"
 
 typedef union _ATermList * ATermList;
 
@@ -12,7 +13,6 @@ typedef union _ATermList * ATermList;
 namespace nix {
 
 
-class Hash;
 class EvalState;
 struct Env;
 struct Value;