diff --git a/xpcom/base/nsMemoryImpl.cpp b/xpcom/base/nsMemoryImpl.cpp
index 7edbc93d2793..18df3396b3fe 100644
--- a/xpcom/base/nsMemoryImpl.cpp
+++ b/xpcom/base/nsMemoryImpl.cpp
@@ -129,8 +129,6 @@ nsMemoryImpl::IsLowMemory(PRBool *result)
     *result = (stat.ullAvailPageFile < kRequiredMemory) &&
         ((float)stat.ullAvailPageFile / stat.ullTotalPageFile) < 0.1;
 #elif defined(NS_OSSO)
-    // We see about 1/4 of the cost by caching the fd and using
-    // rewind.  XXX leaking this fd.
     static int osso_highmark_fd = -1;
     if (osso_highmark_fd == -1) {
         osso_highmark_fd = open (kHighMark, O_RDONLY);