diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 2da67cc29..a59348f40 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -32,6 +32,11 @@
 // The macros generated by configure script.
 #include <srs_auto_headers.hpp>
 
+// To convert macro values to string.
+// @see https://gcc.gnu.org/onlinedocs/cpp/Stringification.html#Stringification
+#define SRS_INTERNAL_STR(v) #v
+#define SRS_XSTR(v) SRS_INTERNAL_STR(v)
+
 // The project informations, may sent to client in HTTP header or RTMP metadata.
 #define RTMP_SIG_SRS_KEY "SRS"
 #define RTMP_SIG_SRS_CODE "OuXuli"
@@ -44,11 +49,6 @@
 #define VERSION_STABLE 2
 #define VERSION_STABLE_BRANCH SRS_XSTR(VERSION_STABLE)".0release"
 
-// To convert macro values to string.
-// @see https://gcc.gnu.org/onlinedocs/cpp/Stringification.html#Stringification
-#define SRS_XSTR(v) SRS_INTERNAL_STR(v)
-#define SRS_INTERNAL_STR(v) #v
-
 // For 32bit os, 2G big file limit for unistd io,
 // ie. read/write/lseek to use 64bits size for huge file.
 #ifndef _FILE_OFFSET_BITS