1 files changed, 2 insertions, 1 deletions
diff --git a/iseq.c b/iseq.c
index 4748bdde90..74a29a6b85 100644
--- a/iseq.c
+++ b/iseq.c
@@ -1831,7 +1831,8 @@ rb_iseq_disasm_insn(VALUE ret, const VALUE *code, size_t pos,
 
     insn_name_buff = insn_name(insn);
     if (1) {
-	rb_str_catf(str, "%04"PRIuSIZE" %-28s ", pos, insn_name_buff);
+	extern const int rb_vm_max_insn_name_size;
+	rb_str_catf(str, "%04"PRIuSIZE" %-*s ", pos, rb_vm_max_insn_name_size, insn_name_buff);
     }
     else {
 	rb_str_catf(str, "%04"PRIuSIZE" %-28.*s ", pos,