diff --git a/appveyor.install.bat b/appveyor.install.bat
index c55ee50cd..8abc0f3fa 100644
--- a/appveyor.install.bat
+++ b/appveyor.install.bat
@@ -11,7 +11,7 @@ if %nocache% == 1 (
 	7z x boost_1_68_0.7z | find "ing archive"
 	cd boost_1_68_0
 	call .\bootstrap.bat
-	call .\b2.exe --prefix=%BOOST_ROOT% toolset=msvc-14.0 variant=release link=static threading=multi runtime-link=static define=BOOST_USE_WINAPI_VERSION=0x0501 cxxflags="/Zc:threadSafeInit- " --with-date_time --with-filesystem --with-locale --with-regex --with-signals --with-system --with-thread -q -d0 install
+	call .\b2.exe --prefix=%BOOST_ROOT% toolset=msvc-14.0 variant=release link=static threading=multi runtime-link=static define=BOOST_USE_WINAPI_VERSION=0x0501 cxxflags="/Zc:threadSafeInit- " --with-date_time --with-filesystem --with-locale --with-regex --with-system --with-thread -q -d0 install
 	xcopy /e /i /y /q %BOOST_ROOT%\include\boost-1_68\boost %BOOST_ROOT%\boost
 	popd
 	if %ERRORLEVEL% NEQ 0 goto ERROR
diff --git a/build.bat b/build.bat
index 9070729e6..cfbe0c27f 100644
--- a/build.bat
+++ b/build.bat
@@ -92,7 +92,6 @@ set BOOST_COMPILED_LIBS=--with-date_time^
  --with-filesystem^
  --with-locale^
  --with-regex^
- --with-signals^
  --with-system^
  --with-thread
 
diff --git a/travis-before-install.sh b/travis-before-install.sh
index 7e2e0c853..c786e98f3 100755
--- a/travis-before-install.sh
+++ b/travis-before-install.sh
@@ -2,7 +2,7 @@
 
 if [[ "$TRAVIS_OS_NAME" == linux ]]; then
   sudo apt-get update
-  sudo apt-get install doxygen libboost-filesystem-dev libboost-locale-dev libboost-regex-dev libboost-signals-dev libboost-system-dev libgoogle-glog-dev libleveldb-dev libmarisa-dev libyaml-cpp-dev -y
+  sudo apt-get install doxygen libboost-filesystem-dev libboost-locale-dev libboost-regex-dev libboost-system-dev libgoogle-glog-dev libleveldb-dev libmarisa-dev libyaml-cpp-dev -y
   make thirdparty/gtest
   make -C thirdparty/src/opencc build
   sudo env "PATH=$PATH" make -C thirdparty/src/opencc install