diff --git a/cmake/Common.cmake b/cmake/Common.cmake
index 796d26c8..fa32e178 100755
--- a/cmake/Common.cmake
+++ b/cmake/Common.cmake
@@ -90,11 +90,12 @@ ELSE ()
     MESSAGE(STATUS "================ ERROR: This platform is unsupported!!! ================")
 ENDIF (UNIX)
 
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsigned-char")
+
 IF (WIN32)
     add_definitions(-DNOMINMAX)
 ENDIF ()
 
-
 #-------------------------------------------------------------
 set(TARS2CPP "${CMAKE_BINARY_DIR}/bin/tars2cpp")
 
diff --git a/servant/makefile/makefile.tars b/servant/makefile/makefile.tars
index 0e810097..cc9f26e9 100644
--- a/servant/makefile/makefile.tars
+++ b/servant/makefile/makefile.tars
@@ -7,7 +7,7 @@ TARS_PATH    :=/usr/local/tars/cpp
 
 CC          = gcc
 CXX         = g++
-CFLAGS      += -std=c++11 -g -O2 -Wno-deprecated -Wall
+CFLAGS      += -std=c++11 -g -O2 -Wno-deprecated -Wall -fsigned-char
 
 #-------------------------------------------------------------------------------
 
diff --git a/servant/makefile/tars-tools.cmake b/servant/makefile/tars-tools.cmake
index a93b2eea..21d49c9a 100755
--- a/servant/makefile/tars-tools.cmake
+++ b/servant/makefile/tars-tools.cmake
@@ -79,6 +79,8 @@ ELSE ()
 	MESSAGE(STATUS "================ ERROR: This platform is unsupported!!! ================")
 ENDIF (UNIX)
 
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsigned-char")
+
 set(TARS_RELEASE "${PROJECT_BINARY_DIR}/run-release.cmake")
 FILE(WRITE ${TARS_RELEASE} "EXECUTE_PROCESS(COMMAND ${CMAKE_COMMAND} -E echo release all)\n")
 
diff --git a/unit-test/rpc/test_proxy_timeout.cpp b/unit-test/rpc/test_proxy_timeout.cpp
index 8b9e938b..89225b81 100755
--- a/unit-test/rpc/test_proxy_timeout.cpp
+++ b/unit-test/rpc/test_proxy_timeout.cpp
@@ -10,22 +10,28 @@ TEST_F(HelloTest, proxyInvokeTimeout)
 		checkSyncTimeout(comm);
 	}, c.get());
 
+    LOG_CONSOLE_DEBUG << endl;
+
 	transInCoroutineGlobalCommunicator([&](Communicator *comm){
 		checkSyncTimeout(comm);
 	}, c.get());
 
+    LOG_CONSOLE_DEBUG << endl;
 	transServerCommunicator([&](Communicator *comm){
 		checkSyncTimeout(comm);
 	});
 
+    LOG_CONSOLE_DEBUG << endl;
 	transInCoroutineServerCommunicator([&](Communicator *comm){
 		checkSyncTimeout(comm);
 	});
 
+    LOG_CONSOLE_DEBUG << endl;
 	transAllocCommunicator([&](Communicator *comm){
 		checkSyncTimeout(comm);
 	});
 
+    LOG_CONSOLE_DEBUG << endl;
 	transInCoroutineAllocCommunicator([&](Communicator *comm){
 		checkSyncTimeout(comm);
 	});