--- a/dom/plugins/base/nsNPAPIPluginStreamListener.cpp
+++ b/dom/plugins/base/nsNPAPIPluginStreamListener.cpp
@@ -645,19 +645,19 @@ nsNPAPIPluginStreamListener::OnDataAvail
       NPPAutoPusher nppPusher(npp);
       
       int32_t writeCount = 0; // bytes consumed by plugin instance
       NS_TRY_SAFE_CALL_RETURN(writeCount, (*pluginFunctions->write)(npp, &mNPStreamWrapper->mNPStream, streamPosition, numtowrite, ptrStreamBuffer), mInst,
                               NS_PLUGIN_CALL_UNSAFE_TO_REENTER_GECKO);
       
       NPP_PLUGIN_LOG(PLUGIN_LOG_NOISY,
                      ("NPP Write called: this=%p, npp=%p, pos=%d, len=%d, "
-                      "buf=%s, return(written)=%d,  url=%s\n",
+                      "buf=%.*s, return(written)=%d,  url=%s\n",
                       this, npp, streamPosition, numtowrite,
-                      ptrStreamBuffer, writeCount, mNPStreamWrapper->mNPStream.url));
+                      numtowrite, ptrStreamBuffer, writeCount, mNPStreamWrapper->mNPStream.url));
       
       if (mStreamState == eStreamStopped) {
         // The plugin called NPN_DestroyStream() from within
         // NPP_Write(), kill the stream.
         return NS_BINDING_ABORTED;
       }
       
       if (writeCount > 0) {