diff --git a/contrib/build_all.bat b/contrib/build_all.bat
index 259843183ef4e60bc9a3460861944fbafacc3aae..5227fdcd4ce39a6461469f9b03062f0e38f3bfea 100644
--- a/contrib/build_all.bat
+++ b/contrib/build_all.bat
@@ -55,7 +55,6 @@ call :build build\opus\SMP\libopus.vcxproj
 
 rem * build ffmpeg *
 %MSYS2_BIN% --login -x %~dp0src/ffmpeg/windows-uwp-x64-configure-make.sh
-for /r %~dp0\qbuild\ffmpeg\Output\Windows10\x64 %%f in (*.pdb) do @copy "%%f" %~dp0\build\ffmpeg\Build\Windows10\x64\bin
 
 rem * build openssl *
 cd build\restbed\dependency\openssl
@@ -69,6 +68,8 @@ rem * build restbed w/asio *
 cd ..\..
 mkdir build
 cd build
+setlocal
+set PATH=C:\\Program Files\\CMake\\bin\\;%PATH%
 cmake -DBUILD_SSL=ON -G "Visual Studio 15 2017 Win64" ..
 cmake --build . --target ALL_BUILD --config Release
 cd ..\..