diff --git a/sdm/libs/utils/sys.cpp b/sdm/libs/utils/sys.cpp
index e54436d3..dd62d6e8 100644
--- a/sdm/libs/utils/sys.cpp
+++ b/sdm/libs/utils/sys.cpp
@@ -30,6 +30,7 @@
 #include <utils/sys.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 #define __CLASS__ "Sys"