diff --git a/cellular_capability_gsm.h b/cellular_capability_gsm.h
index 9fadc6a..8631aa9 100644
--- a/cellular_capability_gsm.h
+++ b/cellular_capability_gsm.h
@@ -236,6 +236,7 @@
   bool scanning_;
   uint16 scan_interval_;
   SimLockStatus sim_lock_status_;
+  bool sim_present_;
   Stringmaps apn_list_;
 
   static unsigned int friendly_service_name_id_;