--- a/js/src/ctypes/CTypes.cpp
+++ b/js/src/ctypes/CTypes.cpp
@@ -1291,16 +1291,22 @@ InitTypeClasses(JSContext* cx, HandleObj
 #include "ctypes/typedefs.h"
 
   // Alias 'ctypes.unsigned' as 'ctypes.unsigned_int', since they represent
   // the same type in C.
   if (!JS_DefineProperty(cx, parent, "unsigned", typeObj_unsigned_int,
                          JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT))
     return false;
 
+  // Alias 'ctypes.jschar' as 'ctypes.char16_t' to prevent breaking addons
+  // that are still using jschar (bug 1064935).
+  if (!JS_DefineProperty(cx, parent, "jschar", typeObj_char16_t,
+                         JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT))
+    return false;
+
   // Create objects representing the special types void_t and voidptr_t.
   RootedObject typeObj(cx,
     CType::DefineBuiltin(cx, parent, "void_t", CTypeProto, CDataProto, "void",
                          TYPE_void_t, JSVAL_VOID, JSVAL_VOID, &ffi_type_void));
   if (!typeObj)
     return false;
 
   typeObj = PointerType::CreateInternal(cx, typeObj);