diff --git a/trunk/src/core/srs_core_autofree.hpp b/trunk/src/core/srs_core_autofree.hpp
index f77c3af08..6e13504c7 100644
--- a/trunk/src/core/srs_core_autofree.hpp
+++ b/trunk/src/core/srs_core_autofree.hpp
@@ -46,11 +46,11 @@
  *      where the char* pstr = new char[size].
  */
 #define SrsAutoFree(className, instance) \
-impl__SrsAutoFree<className> _auto_free_##instance(&instance, false)
+impl_SrsAutoFree<className> _auto_free_##instance(&instance, false)
 #define SrsAutoFreeA(className, instance) \
-impl__SrsAutoFree<className> _auto_free_array_##instance(&instance, true)
+impl_SrsAutoFree<className> _auto_free_array_##instance(&instance, true)
 template<class T>
-class impl__SrsAutoFree
+class impl_SrsAutoFree
 {
 private:
     T** ptr;
@@ -59,12 +59,12 @@ public:
     /**
      * auto delete the ptr.
      */
-    impl__SrsAutoFree(T** p, bool array) {
+    impl_SrsAutoFree(T** p, bool array) {
         ptr = p;
         is_array = array;
     }
     
-    virtual ~impl__SrsAutoFree() {
+    virtual ~impl_SrsAutoFree() {
         if (ptr == NULL || *ptr == NULL) {
             return;
         }