diff --git a/src/user.c b/src/user.c
index 53eb4d2..6cbddfb 100644
--- a/src/user.c
+++ b/src/user.c
@@ -14,13 +14,20 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <string.h>
 #include <stdio.h>
+#include <stdint.h>
 #include <time.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <netinet/in.h>
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <fcntl.h>
+#include <err.h>
 #include <arpa/inet.h>
-#include <netinet/in.h>
 
 #include "common.h"
 #include "encoding.h"