diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 3e8afd2bb1dc..5a4cefc43f40 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -48,6 +48,7 @@
 #include <linux/workqueue.h>
 #include <linux/export.h>
 #include <linux/hashtable.h>
+#include <linux/nospec.h>
 
 /*
  * Management arrays for POSIX timers. Timers are now kept in static hash table
@@ -578,13 +579,21 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
 
 static struct k_clock *clockid_to_kclock(const clockid_t id)
 {
-	if (id < 0)
+	clockid_t idx = id;
+	struct k_clock *kc;
+
+	if (id < 0) {
 		return (id & CLOCKFD_MASK) == CLOCKFD ?
 			&clock_posix_dynamic : &clock_posix_cpu;
+	}
 
-	if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres)
+	if (id >= ARRAY_SIZE(posix_clocks))
 		return NULL;
-	return &posix_clocks[id];
+
+	kc = &posix_clocks[array_index_nospec(idx, ARRAY_SIZE(posix_clocks))];
+	if (!kc->clock_getres)
+		return NULL;
+	return kc;
 }
 
 static int common_timer_create(struct k_itimer *new_timer)