diff --git a/autobuild.xml b/autobuild.xml
index 985bb55902..96f6918a99 100644
--- a/autobuild.xml
+++ b/autobuild.xml
@@ -3235,6 +3235,8 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                 <array>
                   <string>-G</string>
                   <string>${AUTOBUILD_WIN_CMAKE_GEN|NOTWIN}</string>
+                  <string>-A</string>
+                  <string>${AUTOBUILD_WIN_VSPLATFORM|NOTWIN}</string>
                 </array>
               </map>
               <key>default</key>
@@ -3273,6 +3275,8 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                 <array>
                   <string>-G</string>
                   <string>${AUTOBUILD_WIN_CMAKE_GEN|NOTWIN}</string>
+                  <string>-A</string>
+                  <string>${AUTOBUILD_WIN_VSPLATFORM|NOTWIN}</string>
                   <string>-DINSTALL_PROPRIETARY=FALSE</string>
                   <string>-DUSE_KDU=FALSE</string>
                   <string>-DUSE_OPENAL:BOOL=ON</string>
@@ -3307,6 +3311,8 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                 <array>
                   <string>-G</string>
                   <string>${AUTOBUILD_WIN_CMAKE_GEN|NOTWIN}</string>
+                  <string>-A</string>
+                  <string>${AUTOBUILD_WIN_VSPLATFORM|NOTWIN}</string>
                 </array>
               </map>
               <key>name</key>
@@ -3343,6 +3349,8 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                 <array>
                   <string>-G</string>
                   <string>${AUTOBUILD_WIN_CMAKE_GEN|NOTWIN}</string>
+                  <string>-A</string>
+                  <string>${AUTOBUILD_WIN_VSPLATFORM|NOTWIN}</string>
                   <string>-DUNATTENDED:BOOL=ON</string>
                   <string>-DINSTALL_PROPRIETARY=FALSE</string>
                   <string>-DUSE_KDU=FALSE</string>