--- a/src/modes.c
+++ b/src/modes.c
@@ -20,6 +20,7 @@
 
 #include <sys/types.h>
 #include <stdio.h>
+#include <string.h>
 #include "modes.h"
 #include "rc4.h"
 #include "wlan/wlan_compat.h"
--- a/src/wepattack.c
+++ b/src/wepattack.c
@@ -32,6 +32,7 @@
 #include <zlib.h>
 #include <math.h>
 #include <signal.h>
+#include <string.h>
 #include "wepattack.h"
 #include "wepfilter.h"
 #include "log.h"
--- a/src/verify.c
+++ b/src/verify.c
@@ -19,6 +19,7 @@
 
 #include <stdio.h>
 #include <zlib.h>
+#include <string.h> /* memcmp() */
 
 int verify_crc32(unsigned char *data, int length, unsigned long* crc) {