diff --git a/samples/drivers/counter/alarm/README.rst b/samples/drivers/counter/alarm/README.rst
index 25fb8b74b08..9efffc81ae7 100644
--- a/samples/drivers/counter/alarm/README.rst
+++ b/samples/drivers/counter/alarm/README.rst
@@ -9,6 +9,10 @@ This sample provides an example of alarm application using counter API.
 It sets an alarm with an initial delay of 2 seconds. At each alarm
 expiry, a new alarm is configured with a delay multiplied by 2.
 
+.. note::
+   In case of 1Hz frequency (RTC for example), precision is 1 second.
+   Therefore, the sample output may differ in 1 second
+
 Requirements
 ************
 
diff --git a/samples/drivers/counter/alarm/sample.yaml b/samples/drivers/counter/alarm/sample.yaml
index e3401dc39bf..4408f21ca5e 100644
--- a/samples/drivers/counter/alarm/sample.yaml
+++ b/samples/drivers/counter/alarm/sample.yaml
@@ -13,5 +13,5 @@ tests:
             - "Counter alarm sample"
             - "Set alarm in 2 sec"
             - "!!! Alarm !!!"
-            - "Now: 2"
+            - "Now: [2|3]"
     depends_on: counter