--- a/dom/icc/IccInfo.cpp
+++ b/dom/icc/IccInfo.cpp
@@ -148,17 +148,20 @@ NS_IMPL_RELEASE_INHERITED(GsmIccInfo, Ic
 GsmIccInfo::GsmIccInfo(nsPIDOMWindow* aWindow)
   : IccInfo(aWindow)
 {
 }
 
 void
 GsmIccInfo::Update(nsIGsmIccInfo* aInfo)
 {
-  IccInfo::Update(aInfo);
+  nsCOMPtr<nsIIccInfo> iccInfo = do_QueryInterface(aInfo);
+  MOZ_ASSERT(iccInfo);
+
+  IccInfo::Update(iccInfo);
   mGsmIccInfo = aInfo;
 }
 
 JSObject*
 GsmIccInfo::WrapObject(JSContext* aCx)
 {
   return MozGsmIccInfoBinding::Wrap(aCx, this);
 }
@@ -187,17 +190,20 @@ NS_IMPL_RELEASE_INHERITED(CdmaIccInfo, I
 CdmaIccInfo::CdmaIccInfo(nsPIDOMWindow* aWindow)
   : IccInfo(aWindow)
 {
 }
 
 void
 CdmaIccInfo::Update(nsICdmaIccInfo* aInfo)
 {
-  IccInfo::Update(aInfo);
+  nsCOMPtr<nsIIccInfo> iccInfo = do_QueryInterface(aInfo);
+  MOZ_ASSERT(iccInfo);
+
+  IccInfo::Update(iccInfo);
   mCdmaIccInfo = aInfo;
 }
 
 JSObject*
 CdmaIccInfo::WrapObject(JSContext* aCx)
 {
   return MozCdmaIccInfoBinding::Wrap(aCx, this);
 }