diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
index a8a4da1c..ab157094 100644
--- a/gdb/gnu-nat.c
+++ b/gdb/gnu-nat.c
@@ -1016,15 +1016,13 @@ gnu_nat_target::inf_validate_procs (struct inf *inf)
   {
     /* Make things normally linear.  */
     mach_msg_type_number_t search_start = 0;
-    /* Which thread in PROCS corresponds to each task thread, & the task.  */
-    struct proc *matched[num_threads + 1];
+    /* Which thread in PROCS corresponds to each task thread.  */
+    std::vector<struct proc *> matched (num_threads);
     /* The last thread in INF->threads, so we can add to the end.  */
     struct proc *last = 0;
     /* The current thread we're considering.  */
     struct proc *thread = inf->threads;
 
-    memset (matched, 0, sizeof (matched));
-
     while (thread)
       {
 	mach_msg_type_number_t left;