diff --git a/lightningd/plugin.c b/lightningd/plugin.c
index 9a7d18b77..5b1e336f7 100644
--- a/lightningd/plugin.c
+++ b/lightningd/plugin.c
@@ -8,6 +8,7 @@
 #include <ccan/tal/str/str.h>
 #include <errno.h>
 #include <lightningd/json.h>
+#include <signal.h>
 #include <unistd.h>
 
 struct plugin {