Add missing signal.h include
diff --git a/src/main.c b/src/main.c
index 1a6130d..884257f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -31,6 +31,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <signal.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>