1 files changed, 2 insertions, 1 deletions
diff --git a/src/dump.c b/src/dump.c
index 578a22202..57fa7f612 100644
--- a/src/dump.c
+++ b/src/dump.c
@@ -166,7 +166,7 @@ get_syms_block_size(mrb_state *mrb, mrb_irep *irep)
     size += sizeof(uint16_t); /* snl(n) */
     if (irep->syms[sym_no] != 0) {
       mrb_sym2name_len(mrb, irep->syms[sym_no], &len);
-      size += len; /* sn(n) */
+      size += len + 1; /* sn(n) + null char */
     }
   }
 
@@ -194,6 +194,7 @@ write_syms_block(mrb_state *mrb, mrb_irep *irep, uint8_t *buf)
       cur += uint16_to_bin((uint16_t)len, cur); /* length of symbol name */
       memcpy(cur, name, len); /* symbol name */
       cur += (uint16_t)len;
+      *cur++ = '\0';
     }
     else {
       cur += uint16_to_bin(MRB_DUMP_NULL_SYM_LEN, cur); /* length of symbol name */