diff --git a/dom/system/gonk/GonkGPSGeolocationProvider.cpp b/dom/system/gonk/GonkGPSGeolocationProvider.cpp
index f8a96e543da..c3b99a63cd9 100644
--- a/dom/system/gonk/GonkGPSGeolocationProvider.cpp
+++ b/dom/system/gonk/GonkGPSGeolocationProvider.cpp
@@ -449,8 +449,23 @@ GonkGPSGeolocationProvider::SetReferenceLocation()
     nsCOMPtr<nsIDOMMozMobileICCInfo> iccInfo;
     rilCtx->GetIccInfo(getter_AddRefs(iccInfo));
     if (iccInfo) {
-      iccInfo->GetMcc(&location.u.cellID.mcc);
-      iccInfo->GetMnc(&location.u.cellID.mnc);
+      nsresult result;
+      nsAutoString mcc, mnc;
+
+      iccInfo->GetMcc(mcc);
+      iccInfo->GetMnc(mnc);
+
+      location.u.cellID.mcc = mcc.ToInteger(&result, 10);
+      if (result != NS_OK) {
+        NS_WARNING("Cannot parse mcc to integer");
+        location.u.cellID.mcc = 0;
+      }
+
+      location.u.cellID.mnc = mnc.ToInteger(&result, 10);
+      if (result != NS_OK) {
+        NS_WARNING("Cannot parse mnc to integer");
+        location.u.cellID.mnc = 0;
+      }
     }
     nsCOMPtr<nsIDOMMozMobileConnectionInfo> voice;
     rilCtx->GetVoice(getter_AddRefs(voice));