1 files changed, 1 insertions, 0 deletions

diff --git a/lock.c b/lock.c
index 379eba86..a4573493 100644
--- a/lock.c
+++ b/lock.c
@@ -16,6 +16,7 @@
 #include <unistd.h>
 #endif
 #include <fcntl.h>
+#include <signal.h>
 
 #include "fetchmail.h"
 #include "i18n.h"