diff --git a/guest/linux/cgcload/loader.c b/guest/linux/cgcload/loader.c
index 4d7fc053..6eba2c0f 100644
--- a/guest/linux/cgcload/loader.c
+++ b/guest/linux/cgcload/loader.c
@@ -47,6 +47,7 @@
 #include <stdlib.h>
 #include <sys/mman.h>
 #include <sys/prctl.h>
+#include <unistd.h>
 
 #include "cgc.h"
 #include "loader.h"