diff --git a/include/haproxy/debug.h b/include/haproxy/debug.h
index 7bfd12ed6..226108acc 100644
--- a/include/haproxy/debug.h
+++ b/include/haproxy/debug.h
@@ -24,7 +24,6 @@
 
 struct task;
 struct buffer;
-extern volatile unsigned long threads_to_dump;
 extern unsigned int debug_commands_issued;
 void ha_task_dump(struct buffer *buf, const struct task *task, const char *pfx);
 void ha_thread_dump(struct buffer *buf, int thr, int calling_tid);
diff --git a/src/debug.c b/src/debug.c
index 39a6e0231..3fa2845ce 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -50,7 +50,7 @@
 /* mask of threads still having to dump, used to respect ordering. Only used
  * when USE_THREAD_DUMP is set.
  */
-volatile unsigned long threads_to_dump = 0;
+static volatile unsigned long threads_to_dump = 0;
 unsigned int debug_commands_issued = 0;
 
 /* dumps a backtrace of the current thread that is appended to buffer <buf>.
diff --git a/src/wdt.c b/src/wdt.c
index 4e9b7c3ad..9f5b81729 100644
--- a/src/wdt.c
+++ b/src/wdt.c
@@ -84,7 +84,7 @@ void wdt_handler(int sig, siginfo_t *si, void *arg)
 			goto update_and_leave;
 
 		if ((_HA_ATOMIC_LOAD(&th_ctx->flags) & TH_FL_SLEEPING) &&
-		    ((_HA_ATOMIC_LOAD(&ha_tgroup_ctx[tgrp-1].threads_harmless) | threads_to_dump) & thr_bit)) {
+		    (_HA_ATOMIC_LOAD(&ha_tgroup_ctx[tgrp-1].threads_harmless) & thr_bit)) {
 			/* This thread is currently doing exactly nothing
 			 * waiting in the poll loop (unlikely but possible),
 			 * waiting for all other threads to join the rendez-vous