diff --git a/example-clients/control.c b/example-clients/control.c
index 98b41090..363b6b21 100644
--- a/example-clients/control.c
+++ b/example-clients/control.c
@@ -8,6 +8,7 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
+#include <signal.h>
 #include <math.h>
 #include <jack/jack.h>
 
diff --git a/example-clients/metro.c b/example-clients/metro.c
index fa6bd59b..ca702e71 100644
--- a/example-clients/metro.c
+++ b/example-clients/metro.c
@@ -21,6 +21,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <math.h>
+#include <signal.h>
 #include <getopt.h>
 #include <string.h>
 
diff --git a/example-clients/midiseq.c b/example-clients/midiseq.c
index 9d78b01a..10a37b2a 100644
--- a/example-clients/midiseq.c
+++ b/example-clients/midiseq.c
@@ -19,6 +19,7 @@
 #include <jack/jack.h>
 #include <jack/midiport.h>
 #include <stdio.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <unistd.h>
 
diff --git a/example-clients/midisine.c b/example-clients/midisine.c
index 4acb9f22..38299138 100644
--- a/example-clients/midisine.c
+++ b/example-clients/midisine.c
@@ -21,6 +21,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <signal.h>
 #include <math.h>
 
 #include <jack/jack.h>