diff --git a/src/interpreter.c b/src/interpreter.c
index 5760386324527..285f2c52de813 100644
--- a/src/interpreter.c
+++ b/src/interpreter.c
@@ -136,10 +136,10 @@ static jl_value_t *do_invoke(jl_value_t **args, size_t nargs, interpreter_state
     JL_GC_PUSHARGS(argv, nargs - 1);
     size_t i;
     for (i = 1; i < nargs; i++)
-        argv[i] = eval_value(args[i], s);
+        argv[i-1] = eval_value(args[i], s);
     jl_method_instance_t *meth = (jl_method_instance_t*)args[0];
     assert(jl_is_method_instance(meth));
-    jl_value_t *result = jl_invoke(argv[1], &argv[2], nargs - 2, meth);
+    jl_value_t *result = jl_invoke(argv[0], nargs == 2 ? NULL : &argv[1], nargs - 2, meth);
     JL_GC_POP();
     return result;
 }