diff --git a/bacnet-stack/ports/atmega168/apdu.c b/bacnet-stack/ports/atmega168/apdu.c
index cfd0f9cc..3cc2469e 100644
--- a/bacnet-stack/ports/atmega168/apdu.c
+++ b/bacnet-stack/ports/atmega168/apdu.c
@@ -49,6 +49,9 @@ bool apdu_service_supported(
     if (service_supported == SERVICE_SUPPORTED_READ_PROPERTY) {
         status = true;
     }
+    if (service_supported == SERVICE_SUPPORTED_WHO_IS) {
+        status = true;
+    }
 #ifdef WRITE_PROPERTY
     if (service_supported == SERVICE_SUPPORTED_WRITE_PROPERTY) {
         status = true;
diff --git a/bacnet-stack/ports/atmega168/bacnet.aps b/bacnet-stack/ports/atmega168/bacnet.aps
index 55a9cae9..a39bd51c 100644
--- a/bacnet-stack/ports/atmega168/bacnet.aps
+++ b/bacnet-stack/ports/atmega168/bacnet.aps
@@ -1 +1 @@
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