diff --git a/go/expressions.cc b/go/expressions.cc
index d521551..abc4bba 100644
--- a/go/expressions.cc
+++ b/go/expressions.cc
@@ -18338,6 +18338,7 @@
 	    }
 	  imp->require_c_string(")");
 	  expr = Expression::make_call(expr, args, is_varargs, loc);
+          expr->call_expression()->set_varargs_are_lowered();
 	}
       else if (imp->match_c_string("["))
 	{
@@ -19389,4 +19390,3 @@
 
   return (static_cast<unsigned int>(val) + seed) * PRIME;
 }
-