1 files changed, 1 insertions, 0 deletions
diff --git a/util.c b/util.c
index a7c9530bea..132ec5e127 100644
--- a/util.c
+++ b/util.c
@@ -3408,6 +3408,7 @@ Perl_new_struct_thread(pTHX_ struct perl_thread *t)
     PL_screamnext = 0;
     PL_reg_start_tmp = 0;
     PL_reg_start_tmpl = 0;
+    PL_reg_poscache = Nullch;
 
     /* parent thread's data needs to be locked while we make copy */
     MUTEX_LOCK(&t->mutex);