diff --git a/win_build.bat b/win_build.bat
index 8b0db748..f7779bbe 100644
--- a/win_build.bat
+++ b/win_build.bat
@@ -17,7 +17,7 @@ IF %COMPILER%==msys2 (
   bash -lc "cd $APPVEYOR_BUILD_FOLDER && cp -rf windows/* ./"
   bash -lc "cd $APPVEYOR_BUILD_FOLDER && ./bootstrap.sh"
   bash -lc "cd $APPVEYOR_BUILD_FOLDER && ./configure --datadir=/c"
-  bash -lc "cd $APPVEYOR_BUILD_FOLDER && make"
+  bash -lc "cd $APPVEYOR_BUILD_FOLDER && make -j4"
   bash -lc "cd $APPVEYOR_BUILD_FOLDER && make install"
   bash -lc "cd $APPVEYOR_BUILD_FOLDER && cp src/.libs/libpostal-*.dll libpostal.dll"
   "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\lib.exe" /def:libpostal.def /out:libpostal.lib /machine:x64