diff --git a/arch/arm64/src/common/arm64_arch_timer.c b/arch/arm64/src/common/arm64_arch_timer.c
index 06489a30707..21fc07c3adc 100644
--- a/arch/arm64/src/common/arm64_arch_timer.c
+++ b/arch/arm64/src/common/arm64_arch_timer.c
@@ -175,7 +175,7 @@ static int arm64_tick_max_delay(struct oneshot_lowerhalf_s *lower,
 {
   DEBUGASSERT(ticks != NULL);
 
-  *ticks = UINT64_MAX;
+  *ticks = (clock_t)UINT64_MAX;
 
   return OK;
 }