diff --git a/conf.c b/conf.c
index 4d23804..05a8674 100644
--- a/conf.c
+++ b/conf.c
@@ -23,8 +23,10 @@
 #include <limits.h>
 #include <grp.h>
 #include <pwd.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <stdio.h>
 #include <stdbool.h>
 #include <unistd.h>
 #include <syslog.h>
diff --git a/isolation.c b/isolation.c
index 6bae4d4..20dc879 100644
--- a/isolation.c
+++ b/isolation.c
@@ -65,6 +65,7 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
diff --git a/netlink.c b/netlink.c
index 0e0be4f..c8d39a1 100644
--- a/netlink.c
+++ b/netlink.c
@@ -18,6 +18,7 @@
 #include <errno.h>
 #include <sys/types.h>
 #include <limits.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <stdbool.h>
 #include <stdint.h>
diff --git a/passt.c b/passt.c
index f67213a..dfec9d4 100644
--- a/passt.c
+++ b/passt.c
@@ -27,6 +27,8 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <netdb.h>
+#include <signal.h>
+#include <stdio.h>
 #include <string.h>
 #include <errno.h>
 #include <time.h>
diff --git a/tap.c b/tap.c
index 88eed88..15fb52e 100644
--- a/tap.c
+++ b/tap.c
@@ -14,6 +14,7 @@
  */
 
 #include <sched.h>
+#include <signal.h>
 #include <stdio.h>
 #include <errno.h>
 #include <limits.h>
diff --git a/tcp.c b/tcp.c
index 8e8d653..96ca5c7 100644
--- a/tcp.c
+++ b/tcp.c
@@ -267,6 +267,7 @@
 #include <sched.h>
 #include <fcntl.h>
 #include <stdio.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <limits.h>
diff --git a/tcp_splice.c b/tcp_splice.c
index 67af46b..6559762 100644
--- a/tcp_splice.c
+++ b/tcp_splice.c
@@ -32,6 +32,7 @@
  */
 
 #include <sched.h>
+#include <signal.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
diff --git a/udp.c b/udp.c
index ef486fe..0a711f6 100644
--- a/udp.c
+++ b/udp.c
@@ -91,6 +91,7 @@
  */
 
 #include <sched.h>
+#include <signal.h>
 #include <stdio.h>
 #include <errno.h>
 #include <limits.h>
diff --git a/util.c b/util.c
index 799173f..484889b 100644
--- a/util.c
+++ b/util.c
@@ -13,6 +13,7 @@
  */
 
 #include <sched.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <arpa/inet.h>