diff --git a/connectivity/FEATURE_BLE/source/generic/GapImpl.cpp b/connectivity/FEATURE_BLE/source/generic/GapImpl.cpp
index f4661bd6afc..5296ae690f9 100644
--- a/connectivity/FEATURE_BLE/source/generic/GapImpl.cpp
+++ b/connectivity/FEATURE_BLE/source/generic/GapImpl.cpp
@@ -369,6 +369,9 @@ Gap::Gap(
     _advertising_timeout(),
     _scan_timeout(),
     _user_manage_connection_parameter_requests(false)
+#if BLE_ROLE_OBSERVER
+    , _scan_parameters_set(false)
+#endif // BLE_ROLE_OBSERVER
 {
     _pal_gap.initialize();
 
diff --git a/connectivity/FEATURE_BLE/source/generic/GapImpl.h b/connectivity/FEATURE_BLE/source/generic/GapImpl.h
index 5e8a08bcd41..d006738975a 100644
--- a/connectivity/FEATURE_BLE/source/generic/GapImpl.h
+++ b/connectivity/FEATURE_BLE/source/generic/GapImpl.h
@@ -990,9 +990,9 @@ class Gap :
     BitArray<BLE_GAP_MAX_ADVERTISING_SETS> _adv_started_from_refresh;
 
 
-    bool _user_manage_connection_parameter_requests : 1;
+    bool _user_manage_connection_parameter_requests;
 #if BLE_ROLE_OBSERVER
-    bool _scan_parameters_set : 1 = false;
+    bool _scan_parameters_set;
 #endif // BLE_ROLE_OBSERVER
 
 };