diff --git a/trunk/src/core/srs_core.cpp b/trunk/src/core/srs_core.cpp
index 9ec0f1060..29b882ebe 100644
--- a/trunk/src/core/srs_core.cpp
+++ b/trunk/src/core/srs_core.cpp
@@ -52,14 +52,14 @@ bool _SrsContextId::empty() const
     return v_.empty();
 }
 
+int _SrsContextId::compare(const _SrsContextId& to) const
+{
+    return v_.compare(to.v_);
+}
+
 _SrsContextId& _SrsContextId::set_value(const std::string& v)
 {
     v_ = v;
     return *this;
 }
 
-int _SrsContextId::compare(const _SrsContextId& to) const
-{
-    return v_.compare(to.v_);
-}
-
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index c71b54378..e3dd74ce9 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -130,13 +130,13 @@ public:
 public:
     const char* c_str() const;
     bool empty() const;
-    // Set the value of context id.
-    _SrsContextId& set_value(const std::string& v);
     // Compare the two context id. @see http://www.cplusplus.com/reference/string/string/compare/
     //      0	They compare equal
     //      <0	Either the value of the first character that does not match is lower in the compared string, or all compared characters match but the compared string is shorter.
     //      >0	Either the value of the first character that does not match is greater in the compared string, or all compared characters match but the compared string is longer.
     int compare(const _SrsContextId& to) const;
+    // Set the value of context id.
+    _SrsContextId& set_value(const std::string& v);
 };
 typedef _SrsContextId SrsContextId;
 #else