diff --git a/src/apps/clock/cl_wind.cpp b/src/apps/clock/cl_wind.cpp
index d3add2bac4..6aa6b5f398 100644
--- a/src/apps/clock/cl_wind.cpp
+++ b/src/apps/clock/cl_wind.cpp
@@ -13,6 +13,7 @@
 
 
 #include <fcntl.h>
+#include <unistd.h>
 #include <sys/stat.h>