diff --git a/include/asterisk/utils.h b/include/asterisk/utils.h
index 44994f4c07..3e789019af 100644
--- a/include/asterisk/utils.h
+++ b/include/asterisk/utils.h
@@ -33,6 +33,7 @@
 #include <netdb.h>
 #include <limits.h>
 #include <time.h>	/* we want to override localtime_r */
+#include <unistd.h>
 
 #include "asterisk/lock.h"
 #include "asterisk/time.h"