diff --git a/gc.c b/gc.c
index 5067d8fe05..113e13d51b 100644
--- a/gc.c
+++ b/gc.c
@@ -1405,7 +1405,8 @@ mark_method_entry_i(ID key, const rb_method_entry_t *me, st_data_t data)
 }
 
 static void
-mark_m_tbl(rb_objspace_t *objspace, st_table *tbl, int lev) {
+mark_m_tbl(rb_objspace_t *objspace, st_table *tbl, int lev)
+{
     struct mark_tbl_arg arg;
     if (!tbl) return;
     arg.objspace = objspace;
diff --git a/method.h b/method.h
index 6032d572d7..0185c059b5 100644
--- a/method.h
+++ b/method.h
@@ -59,7 +59,7 @@ typedef struct rb_method_entry_struct {
 	rb_iseq_t *iseq;            /* should be mark */
 	rb_method_cfunc_t cfunc;
 	ID attr_id;
-	VALUE proc;
+	VALUE proc;                 /* should be mark */
 	enum method_optimized_type {
 	    OPTIMIZED_METHOD_TYPE_SEND,
 	    OPTIMIZED_METHOD_TYPE_CALL