diff --git a/ble/services/LinkLossService.h b/ble/services/LinkLossService.h
index a7c86fa..66a1ac2 100644
--- a/ble/services/LinkLossService.h
+++ b/ble/services/LinkLossService.h
@@ -81,7 +81,7 @@ class LinkLossService {
      *     Information about the characterisitc being updated.
      */
     virtual void onDataWritten(const GattWriteCallbackParams *params) {
-        if (params->charHandle == alertLevelChar.getValueHandle()) {
+        if (params->handle == alertLevelChar.getValueHandle()) {
             alertLevel = *reinterpret_cast<const AlertLevel_t *>(params->data);
         }
     }