diff --git a/tools/csr_usb.c b/tools/csr_usb.c
index a483bc1..5fb6bdc 100644
--- a/tools/csr_usb.c
+++ b/tools/csr_usb.c
@@ -33,6 +33,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <dirent.h>
+#include <limits.h>
 #include <sys/ioctl.h>
 
 #include "csr.h"
diff --git a/tools/hciconfig.c b/tools/hciconfig.c
index 0e536be..548e572 100644
--- a/tools/hciconfig.c
+++ b/tools/hciconfig.c
@@ -37,6 +37,7 @@
 #include <sys/param.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
+#include <sys/stat.h>
 
 #include <bluetooth/bluetooth.h>
 #include <bluetooth/hci.h>
diff --git a/tools/hid2hci.c b/tools/hid2hci.c
index 95b4abf..2dbfca7 100644
--- a/tools/hid2hci.c
+++ b/tools/hid2hci.c
@@ -35,6 +35,7 @@
 #include <string.h>
 #include <dirent.h>
 #include <getopt.h>
+#include <limits.h>
 #include <sys/ioctl.h>
 #include <linux/types.h>
 #include <linux/hiddev.h>