1 files changed, 2 insertions, 2 deletions
diff --git a/src/libexpr/common-opts.cc b/src/libexpr/common-opts.cc
index 6171de0f0e84..a25317de1346 100644
--- a/src/libexpr/common-opts.cc
+++ b/src/libexpr/common-opts.cc
@@ -20,10 +20,10 @@ bool parseOptionArg(const string & arg, Strings::iterator & i,
     if (i == argsEnd) throw error;
     string value = *i++;
 
-    Value & v(autoArgs[name]);
+    Value & v(autoArgs[state.symbols.create(name)]);
 
     if (arg == "--arg")
-        state.mkThunk_(v, parseExprFromString(value, absPath(".")));
+        state.mkThunk_( v, parseExprFromString(state, value, absPath(".")));
     else
         mkString(v, value);