1 files changed, 1 insertions, 1 deletions
diff --git a/src/dump.c b/src/dump.c
index 3000f2bcf..578a22202 100644
--- a/src/dump.c
+++ b/src/dump.c
@@ -90,7 +90,7 @@ get_pool_block_size(mrb_state *mrb, mrb_irep *irep)
       break;
 
     case MRB_TT_STRING:
-      str = mrb_string_value(mrb, &irep->pool[pool_no]);
+      str = mrb_str_to_str(mrb, irep->pool[pool_no]);
       size += RSTRING_LEN(str);
       break;