diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index ef02d94..e492805 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -77,6 +77,7 @@
 #ifdef UML_CONFIG_NO_HZ
 static int after_sleep_interval(struct timespec *ts)
 {
+	return 0;
 }
 #else
 static inline long long timespec_to_us(const struct timespec *ts)