diff --git a/content/html/document/src/nsHTMLDocument.cpp b/content/html/document/src/nsHTMLDocument.cpp
index 4999e9292af6..2ff2b98ef632 100644
--- a/content/html/document/src/nsHTMLDocument.cpp
+++ b/content/html/document/src/nsHTMLDocument.cpp
@@ -921,7 +921,7 @@ nsHTMLDocument::StartDocumentLoad(const char* aCommand,
                  "How did those end up different here?  wyciwyg channels are "
                  "not nsICachingChannel");
     rv = cachingChan->SetCacheTokenCachedCharset(charset);
-    NS_ASSERTION(NS_SUCCEEDED(rv),"cannot SetMetaDataElement");
+    NS_WARN_IF_FALSE(NS_SUCCEEDED(rv), "cannot SetMetaDataElement");
   }
 
   // Set the parser as the stream listener for the document loader...