diff --git a/snippets/test1/test1.c b/snippets/test1/test1.c
index 5f3816b..1f29f2a 100644
--- a/snippets/test1/test1.c
+++ b/snippets/test1/test1.c
@@ -118,7 +118,7 @@ void init() {
   digitalWrite(CTRL_OUT, 0);
 
   pinMode(INTR_IN, INPUT);
-  wiringPiISR(INTR_IN, INT_EDGE_FALLING, isr);
+  wiringPiISR(INTR_IN, INT_EDGE_RISING, isr);
 }
 
 void initCounter() {