diff --git a/lib/posix/timer.c b/lib/posix/timer.c
index e8fb63e8d78..3eea898e97b 100644
--- a/lib/posix/timer.c
+++ b/lib/posix/timer.c
@@ -12,7 +12,7 @@
 #define ACTIVE 1
 #define NOT_ACTIVE 0
 
-static void zephyr_timer_wrapper(struct k_timer *timer);
+static void zephyr_timer_wrapper(struct k_timer *ztimer);
 
 struct timer_obj {
 	struct k_timer ztimer;