1 files changed, 1 insertions, 1 deletions
diff --git a/error.c b/error.c
index c510432c9d..2f24929d44 100644
--- a/error.c
+++ b/error.c
@@ -2619,7 +2619,7 @@ name_err_mesg_to_str(VALUE obj)
     VALUE mesg = ptr->mesg;
     if (NIL_P(mesg)) return Qnil;
     else {
-        struct RString s_str, c_str, d_str;
+        struct RString s_str = {RBASIC_INIT}, c_str = {RBASIC_INIT}, d_str = {RBASIC_INIT};
         VALUE c, s, d = 0, args[4], c2;
         int state = 0;
         rb_encoding *usascii = rb_usascii_encoding();