diff --git a/inet.c b/inet.c
index fa95e10..381f7f3 100644
--- a/inet.c
+++ b/inet.c
@@ -7,6 +7,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <arpa/inet.h>
+#include <signal.h>
 
 noreturn void err(const char *fn) {
   perror(fn);