diff --git a/drivers/syslog/vsyslog.c b/drivers/syslog/vsyslog.c
index 94e818dc04..0b993b7186 100644
--- a/drivers/syslog/vsyslog.c
+++ b/drivers/syslog/vsyslog.c
@@ -41,6 +41,7 @@
 
 #include <stdio.h>
 #include <syslog.h>
+#include <errno.h>
 
 #include <nuttx/init.h>
 #include <nuttx/arch.h>