diff --git a/vm.c b/vm.c
index 1cbd3b9262..faca7c41a1 100644
--- a/vm.c
+++ b/vm.c
@@ -1021,7 +1021,7 @@ invoke_iseq_block_from_c(rb_thread_t *th, const struct rb_captured_block *captur
     }
 
     opt_pc = vm_yield_setup_args(th, iseq, argc, sp, passed_block_handler,
-				 (is_lambda ? (splattable ? arg_setup_lambda : arg_setup_method) : arg_setup_block));
+				 (is_lambda ? arg_setup_method : arg_setup_block));
     cfp->sp = sp;
 
     if (me == NULL) {
diff --git a/vm_args.c b/vm_args.c
index ae27d27d8c..59bd87ebf0 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -29,8 +29,7 @@ struct args_info {
 
 enum arg_setup_type {
     arg_setup_method,
-    arg_setup_block,
-    arg_setup_lambda
+    arg_setup_block
 };
 
 static inline int
@@ -595,8 +594,6 @@ setup_parameters_complex(rb_thread_t * const th, const rb_iseq_t * const iseq,
 	    given_argc = RARRAY_LENINT(args->rest);
 	}
 	break;
-      case arg_setup_lambda:
-	break;
     }
 
     /* argc check */
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 55eb00f86b..e70cb646da 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -2677,7 +2677,7 @@ vm_invoke_iseq_block(rb_thread_t *th, rb_control_frame_t *reg_cfp,
     const rb_iseq_t *iseq = rb_iseq_check(captured->code.iseq);
     const int arg_size = iseq->body->param.size;
     VALUE * const rsp = GET_SP() - calling->argc;
-    int opt_pc = vm_callee_setup_block_arg(th, calling, ci, iseq, rsp, is_lambda ? arg_setup_lambda : arg_setup_block);
+    int opt_pc = vm_callee_setup_block_arg(th, calling, ci, iseq, rsp, is_lambda ? arg_setup_method : arg_setup_block);
 
     SET_SP(rsp);