diff --git a/demos/KINETIS/RT-FREEDOM-KL25Z/main.c b/demos/KINETIS/RT-FREEDOM-KL25Z/main.c
index 8125e198a..a99d1bb9d 100644
--- a/demos/KINETIS/RT-FREEDOM-KL25Z/main.c
+++ b/demos/KINETIS/RT-FREEDOM-KL25Z/main.c
@@ -27,6 +27,8 @@ static THD_FUNCTION(Thread1, arg) {
     palTogglePad(IOPORT2, 18);
     chThdSleepMilliseconds(300);
   }
+
+  return 0;
 }
 
 static THD_WORKING_AREA(waThread2, 64);
@@ -38,6 +40,8 @@ static THD_FUNCTION(Thread2, arg) {
     palTogglePad(IOPORT2, 19);
     chThdSleepMilliseconds(600);
   }
+
+  return 0;
 }
 
 static THD_WORKING_AREA(waThread3, 64);
@@ -49,6 +53,8 @@ static THD_FUNCTION(Thread3, arg) {
     palTogglePad(IOPORT4, 1);
     chThdSleepMilliseconds(900);
   }
+
+  return 0;
 }
 
 /*