diff --git a/src/debug.c b/src/debug.c
index de1dfb8f9..d052f5b63 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -2347,7 +2347,6 @@ static int debug_iohandler_counters(struct appctx *appctx)
 void debug_handler(int sig, siginfo_t *si, void *arg)
 {
 	struct buffer *buf = HA_ATOMIC_LOAD(&th_ctx->thread_dump_buffer);
-	int harmless = is_thread_harmless();
 	int no_return = 0;
 
 	/* first, let's check it's really for us and that we didn't just get
@@ -2371,13 +2370,6 @@ void debug_handler(int sig, siginfo_t *si, void *arg)
 	 */
 	ha_thread_dump_one(tid, 1);
 
-	/* mark the current thread as stuck to detect it upon next invocation
-	 * if it didn't move.
-	 */
-	if (!harmless &&
-	    !(_HA_ATOMIC_LOAD(&th_ctx->flags) & TH_FL_SLEEPING))
-		_HA_ATOMIC_OR(&th_ctx->flags, TH_FL_STUCK);
-
 	/* in case of panic, no return is planned so that we don't destroy
 	 * the buffer's contents and we make sure not to trigger in loops.
 	 */