diff --git a/trunk/research/Makefile b/trunk/research/Makefile
index daa68cb14..d805a8ef9 100644
--- a/trunk/research/Makefile
+++ b/trunk/research/Makefile
@@ -1,2 +1,2 @@
-ts_info: ts_info.cpp Makefile
-	g++ -o ts_info ts_info.cpp -g -O0 -ansi
+ts_info: ts_info.cc Makefile
+	g++ -o ts_info ts_info.cc -g -O0 -ansi
diff --git a/trunk/research/ts_info.cpp b/trunk/research/ts_info.cc
similarity index 96%
rename from trunk/research/ts_info.cpp
rename to trunk/research/ts_info.cc
index aebc713ca..0ba7f9232 100755
--- a/trunk/research/ts_info.cpp
+++ b/trunk/research/ts_info.cc
@@ -1,5 +1,5 @@
 /**
-g++ -o ts_info ts_info.cpp -g -O0 -ansi
+g++ -o ts_info ts_info.cc -g -O0 -ansi
 */
 #if 1
 // for int64_t print using PRId64 format.
diff --git a/trunk/src/srs/srs.upp b/trunk/src/srs/srs.upp
index fa698f372..f7517cd8c 100755
--- a/trunk/src/srs/srs.upp
+++ b/trunk/src/srs/srs.upp
@@ -43,7 +43,7 @@ file
     ..\core\srs_core_log.hpp,
     ..\core\srs_core_log.cpp,
     research readonly separator,
-    ..\..\research\ts_info.cpp;
+    ..\..\research\ts_info.cc;
 mainconfig
 	"" = "MAIN";