diff --git a/apps/openmw/mwclass/container.cpp b/apps/openmw/mwclass/container.cpp
index 28fa723786..07f1c26ce7 100644
--- a/apps/openmw/mwclass/container.cpp
+++ b/apps/openmw/mwclass/container.cpp
@@ -95,9 +95,15 @@ namespace MWClass
         bool needKey = ptr.getCellRef().mLockLevel>0;
         bool hasKey = false;
         std::string keyName;
+	
+	// make key id lowercase
+	std::string keyId = ptr.getCellRef().mKey;
+	std::transform(keyId.begin(), keyId.end(), keyId.begin(), ::tolower);
         for (MWWorld::ContainerStoreIterator it = invStore.begin(); it != invStore.end(); ++it)
         {
-            if (it->getCellRef ().mRefID == ptr.getCellRef().mKey)
+	    std::string refId = it->getCellRef().mRefID;
+	    std::transform(refId.begin(), refId.end(), refId.begin(), ::tolower);
+            if (refId == keyId)
             {
                 hasKey = true;
                 keyName = MWWorld::Class::get(*it).getName(*it);