1 files changed, 2 insertions, 1 deletions
diff --git a/src/nix/repl.cc b/src/nix/repl.cc
index 9c0d22438..07bf32a0a 100644
--- a/src/nix/repl.cc
+++ b/src/nix/repl.cc
@@ -644,7 +644,8 @@ void NixRepl::addVarToScope(const Symbol & name, Value & v)
 {
     if (displ >= envSize)
         throw Error("environment full; cannot add more variables");
-    staticEnv.vars[name] = displ;
+    staticEnv.vars.emplace_back(name, displ);
+    staticEnv.sort();
     env->values[displ++] = &v;
     varNames.insert((string) name);
 }