diff --git a/include/MacStd/CoreFoundation.hpp b/include/MacStd/CoreFoundation.hpp
index fa509c2..f9f76f1 100644
--- a/include/MacStd/CoreFoundation.hpp
+++ b/include/MacStd/CoreFoundation.hpp
@@ -43,6 +43,7 @@ namespace macstd {
 	using cfdata = cfobject<CFDataRef>;
 	using cfdictionary = cfobject<CFDictionaryRef>;
 	using cferror = cfobject<CFErrorRef>;
+	using cfmutabledata = cfobject<CFMutableDataRef>;
 	using cfreadstream = cfobject<CFReadStreamRef>;
 	using cfurl = cfobject<CFURLRef>;