diff --git a/src/vm.c b/src/vm.c
index b9292693c..70e7005f2 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -2630,6 +2630,7 @@ RETRY_TRY_BLOCK:
       pool = irep->pool;
       syms = irep->syms;
       stack_extend(mrb, irep->nregs);
+      stack_clear(regs+1, irep->nregs-1);
       ci->nregs = irep->nregs;
       pc = irep->iseq;
       JUMP;