diff --git a/libs/libc/time/lib_gmtimer.c b/libs/libc/time/lib_gmtimer.c
index 6012b2cc45..54d01e7363 100644
--- a/libs/libc/time/lib_gmtimer.c
+++ b/libs/libc/time/lib_gmtimer.c
@@ -46,6 +46,7 @@
 #include <debug.h>
 
 #include <nuttx/time.h>
+#include <nuttx/clock.h>
 
 /****************************************************************************
  * Private Function Prototypes