diff --git a/autobuild.xml b/autobuild.xml
index dee9fed12207be8c162500971dc4cb9f25009ae5..e7547a0b7ede1ebfc70d1108894baee418cc6148 100644
--- a/autobuild.xml
+++ b/autobuild.xml
@@ -3051,7 +3051,7 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                 <key>options</key>
                 <array>
                   <string>-G</string>
-                  <string>Unix Makefiles</string>
+                  <string>Ninja</string>
                 </array>
               </map>
               <key>default</key>
@@ -3080,7 +3080,7 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                 <key>options</key>
                 <array>
                   <string>-G</string>
-                  <string>Unix Makefiles</string>
+                  <string>Ninja</string>
                 </array>
               </map>
               <key>name</key>
@@ -3111,7 +3111,7 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                 <key>options</key>
                 <array>
                   <string>-G</string>
-                  <string>Unix Makefiles</string>
+                  <string>Ninja</string>
                 </array>
               </map>
               <key>name</key>
@@ -3138,7 +3138,7 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
                 <key>options</key>
                 <array>
                   <string>-G</string>
-                  <string>Unix Makefiles</string>
+                  <string>Ninja</string>
                 </array>
               </map>
               <key>name</key>