diff --git a/src/gc.c b/src/gc.c
index 4f203b92b..309a5c6e8 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -1812,6 +1812,8 @@ gc_stat(mrb_state *mrb, mrb_value self)
   mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_lit(mrb, "step_limit")), mrb_int_value(mrb, (mrb_int)gc->step_limit));
   mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_lit(mrb, "malloc_increase")), mrb_int_value(mrb, (mrb_int)gc->malloc_increase));
   mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_lit(mrb, "malloc_threshold")), mrb_int_value(mrb, (mrb_int)gc->malloc_threshold));
+  mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_lit(mrb, "symbol_count")), mrb_int_value(mrb, (mrb_int)(MRB_PRESYM_MAX + mrb->symidx)));
+  mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_lit(mrb, "dynamic_symbol_count")), mrb_int_value(mrb, (mrb_int)mrb->dynamic_sym_count));
 
 #ifdef MRB_GC_STATS
   mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_lit(mrb, "total")), mrb_int_value(mrb, (mrb_int)gc->gc_total_count));