--- a/lib/regcomp.c	2020-10-22 13:49:06.770168928 +0000
+++ b/lib/regcomp.c	2020-10-22 13:50:37.026528298 +0000
@@ -3662,7 +3662,7 @@
   Idx alloc = 0;
 #endif /* not RE_ENABLE_I18N */
   reg_errcode_t ret;
-  re_token_t br_token;
+  re_token_t br_token = {0};
   bin_tree_t *tree;
 
   sbcset = (re_bitset_ptr_t) calloc (sizeof (bitset_t), 1);
