diff --git a/mozilla/base/src/windows/nsFileSpecWin.cpp b/mozilla/base/src/windows/nsFileSpecWin.cpp
index 4bfed1a135a..bc138c64fec 100644
--- a/mozilla/base/src/windows/nsFileSpecWin.cpp
+++ b/mozilla/base/src/windows/nsFileSpecWin.cpp
@@ -143,7 +143,7 @@ void nsNativeFileSpec::operator += (const char* inRelativePath)
 } // nsNativeFileSpec::operator +=
 
 //----------------------------------------------------------------------------------------
-void nsNativeFileSpec::CreateDirectory(int mode)
+void nsNativeFileSpec::CreateDirectory(int /*mode*/)
 //----------------------------------------------------------------------------------------
 {
 	// Note that mPath is canonical!
diff --git a/mozilla/xpcom/io/nsFileSpecWin.cpp b/mozilla/xpcom/io/nsFileSpecWin.cpp
index 4bfed1a135a..bc138c64fec 100644
--- a/mozilla/xpcom/io/nsFileSpecWin.cpp
+++ b/mozilla/xpcom/io/nsFileSpecWin.cpp
@@ -143,7 +143,7 @@ void nsNativeFileSpec::operator += (const char* inRelativePath)
 } // nsNativeFileSpec::operator +=
 
 //----------------------------------------------------------------------------------------
-void nsNativeFileSpec::CreateDirectory(int mode)
+void nsNativeFileSpec::CreateDirectory(int /*mode*/)
 //----------------------------------------------------------------------------------------
 {
 	// Note that mPath is canonical!