1 files changed, 1 insertions, 0 deletions

diff --git a/vm.c b/vm.c
index 1b152cb8ea..8efc6cdb9c 100644
--- a/vm.c
+++ b/vm.c
@@ -1381,6 +1381,7 @@ static void
 vm_init2(rb_vm_t *vm)
 {
     MEMZERO(vm, rb_vm_t, 1);
+    vm->src_encoding_index = -1;
 }
 
 /* Thread */