diff --git a/include/nuttx/clock.h b/include/nuttx/clock.h
index c4f94e41388fc..61f8fbe21907f 100644
--- a/include/nuttx/clock.h
+++ b/include/nuttx/clock.h
@@ -425,7 +425,7 @@ EXTERN volatile clock_t g_system_ticks;
           _nsec += NSEC_PER_SEC; \
           _sec--; \
         } \
-      if ((int64_t)_sec < 0) \
+      if ((sclock_t)_sec < 0) \
         { \
           _sec = 0; \
           _nsec = 0; \