diff --git a/autobuild.xml b/autobuild.xml
index 31ab78c79b..9c8bf57f60 100644
--- a/autobuild.xml
+++ b/autobuild.xml
@@ -3676,6 +3676,7 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                   <string>${AUTOBUILD_WIN_CMAKE_GEN|NOTWIN}</string>
                   <string>-A</string>
                   <string>${AUTOBUILD_WIN_VSPLATFORM|NOTWIN}</string>
+                  <string>-DPYTHON_EXECUTABLE=C:\Windows\py.exe</string>
                 </array>
               </map>
               <key>default</key>
@@ -3719,6 +3720,7 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                   <string>-DINSTALL_PROPRIETARY=FALSE</string>
                   <string>-DUSE_KDU=FALSE</string>
                   <string>-DUSE_OPENAL:BOOL=ON</string>
+                  <string>-DPYTHON_EXECUTABLE=C:\Windows\py.exe</string>
                 </array>
               </map>
               <key>name</key>
@@ -3752,6 +3754,7 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                   <string>${AUTOBUILD_WIN_CMAKE_GEN|NOTWIN}</string>
                   <string>-A</string>
                   <string>${AUTOBUILD_WIN_VSPLATFORM|NOTWIN}</string>
+                  <string>-DPYTHON_EXECUTABLE=C:\Windows\py.exe</string>
                 </array>
               </map>
               <key>name</key>
@@ -3794,6 +3797,7 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                   <string>-DINSTALL_PROPRIETARY=FALSE</string>
                   <string>-DUSE_KDU=FALSE</string>
                   <string>-DUSE_OPENAL:BOOL=ON</string>
+                  <string>-DPYTHON_EXECUTABLE=C:\Windows\py.exe</string>
                 </array>
               </map>
               <key>name</key>