diff --git a/appveyor.yml b/appveyor.yml
index cee15e91..36af19b2 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -8,11 +8,23 @@ install:
 
       7z x c:\installers\nasm-2.10.01-win32.zip -oc:\ > c:\installers\nasm.install.log
 
+      if not exist c:\installers\i686-6.4.0-release-posix-dwarf-rt_v5-rev0.7z curl -fSL -o c:\installers\i686-6.4.0-release-posix-dwarf-rt_v5-rev0.7z "https://sourceforge.net/projects/mingw-w64/files/Toolchains targetting Win32/Personal Builds/mingw-builds/6.4.0/threads-posix/dwarf/i686-6.4.0-release-posix-dwarf-rt_v5-rev0.7z"
+
+      md "c:\Program Files (x86)\mingw-w64\i686-6.4.0-posix-dwarf-rt_v5-rev0"
+
+      7z x c:\installers\i686-6.4.0-release-posix-dwarf-rt_v5-rev0.7z -o"c:\Program Files (x86)\mingw-w64\i686-6.4.0-posix-dwarf-rt_v5-rev0" > c:\installers\mingw32.install.log
+
+      if not exist c:\installers\x86_64-6.4.0-release-posix-seh-rt_v5-rev0.7z curl -fSL -o c:\installers\x86_64-6.4.0-release-posix-seh-rt_v5-rev0.7z "https://sourceforge.net/projects/mingw-w64/files/Toolchains targetting Win64/Personal Builds/mingw-builds/6.4.0/threads-posix/seh/x86_64-6.4.0-release-posix-seh-rt_v5-rev0.7z"
+
+      md "c:\Program Files\mingw-w64\x86_64-6.4.0-posix-seh-rt_v5-rev0"
+
+      7z x c:\installers\x86_64-6.4.0-release-posix-seh-rt_v5-rev0.7z -o"c:\Program Files\mingw-w64\x86_64-6.4.0-posix-seh-rt_v5-rev0" > c:\installers\mingw64.install.log
+
       set INCLUDE=c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include;c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\include
 
       set LIB=c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\lib\amd64;c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\lib\x64
 
-      set PATH=c:\nasm-2.10.01;c:\Program Files (x86)\NSIS;c:\msys64\mingw32\bin;c:\msys64\usr\bin;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\amd64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE;c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\bin\x64;c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\bin;%PATH%
+      set PATH=c:\nasm-2.10.01;c:\Program Files (x86)\NSIS;c:\msys64\usr\bin;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\amd64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE;c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\bin\x64;c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\bin;%PATH%
 
       set MSYSTEM=MINGW32
 
@@ -24,6 +36,8 @@ install:
 
 cache:
   - c:\installers\nasm-2.10.01-win32.zip -> appveyor.yml
+  - c:\installers\i686-6.4.0-release-posix-dwarf-rt_v5-rev0.7z -> appveyor.yml
+  - c:\installers\x86_64-6.4.0-release-posix-seh-rt_v5-rev0.7z -> appveyor.yml
 
 build_script:
   - cmd: >-