diff --git a/vkdgen.py b/vkdgen.py
index e94355b..6e5a2fc 100644
--- a/vkdgen.py
+++ b/vkdgen.py
@@ -326,7 +326,7 @@ def emitType(ext, name, typeinfo):
 				params = "".join(islice(typeinfo.elem.itertext(), 2, None))[2:]
 				if params == "void);":
 					params = ");"
-				self.typesFile.write("\talias %s = %s function(%s\n" % (name, returnType, params))
+				self.typesFile.write("\talias %s = extern(System) %s function(%s\n" % (name, returnType, params))
 				
 			elif typ == "struct" or typ == "union":
 				emitStruct(ext, name, typeinfo)