diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 333748973d..993d290eb3 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -1392,6 +1392,7 @@ void EvalState::createBaseEnv()
         mkAttrs(*v2, 2);
         mkString(*allocAttr(*v2, symbols.create("path")), i.second);
         mkString(*allocAttr(*v2, symbols.create("prefix")), i.first);
+        v2->attrs->sort();
     }
     addConstant("nixPath", v);