diff --git a/core/common/src/test/java/org/onosproject/store/trivial/SimpleDeviceStore.java b/core/common/src/test/java/org/onosproject/store/trivial/SimpleDeviceStore.java
index 04d376c..a3761b0 100644
--- a/core/common/src/test/java/org/onosproject/store/trivial/SimpleDeviceStore.java
+++ b/core/common/src/test/java/org/onosproject/store/trivial/SimpleDeviceStore.java
@@ -126,6 +126,11 @@
     }
 
     @Override
+    public int getAvailableDeviceCount() {
+        return availableDevices.size();
+    }
+
+    @Override
     public Iterable<Device> getDevices() {
         return Collections.unmodifiableCollection(devices.values());
     }