diff --git a/Python/symtable.c b/Python/symtable.c
index c18b39ecf15..51b59f0310d 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -59,6 +59,7 @@ ste_new(struct symtable *st, identifier name, _Py_block_ty block,
     ste->ste_varargs = 0;
     ste->ste_varkeywords = 0;
     ste->ste_opt_lineno = 0;
+    ste->ste_tmpname = 0;
     ste->ste_lineno = lineno;
 
     if (st->st_cur != NULL &&