diff --git a/widget/windows/nsTextStore.cpp b/widget/windows/nsTextStore.cpp
index 3902b1619e32..51b231b252b1 100644
--- a/widget/windows/nsTextStore.cpp
+++ b/widget/windows/nsTextStore.cpp
@@ -4827,7 +4827,7 @@ nsTextStore::MouseTracker::UnadviseSink()
   PR_LOG(sTextStoreLog, PR_LOG_DEBUG,
          ("TSF: 0x%p   nsTextStore::MouseTracker::UnadviseSink(), "
           "mCookie=%d, mSink=0x%p, mStart=%d, mLength=%d",
-          this, mCookie, mSink, mStart, mLength));
+          this, mCookie, mSink.get(), mStart, mLength));
   mSink = nullptr;
   mStart = mLength = -1;
 }