--- a/netwerk/protocol/http/nsHttpChannel.cpp
+++ b/netwerk/protocol/http/nsHttpChannel.cpp
@@ -6699,17 +6699,17 @@ nsHttpChannel::ForceCacheEntryValidFor(u
              "for this channel [this=%p].", this));
     } else {
         mCacheEntry->ForceValidFor(aSecondsToTheFuture);
 
         nsAutoCString key;
         mCacheEntry->GetKey(key);
 
         LOG(("nsHttpChannel::ForceCacheEntryValidFor successfully forced valid "
-             "entry with key %s for %d seconds. [this=%p]", ToNewCString(key),
+             "entry with key %s for %d seconds. [this=%p]", key.get(),
              aSecondsToTheFuture, this));
     }
 
     return NS_OK;
 }
 
 //-----------------------------------------------------------------------------
 // nsHttpChannel::nsIResumableChannel