diff --git a/autobuild.xml b/autobuild.xml
index 80be16322a4cf4b14a861c1fac59b9ead4769f4f..a8aa9371d65126f87bc1cf15640a8a1acd60bb4a 100644
--- a/autobuild.xml
+++ b/autobuild.xml
@@ -1672,7 +1672,6 @@
                   <string>-DCMAKE_BUILD_TYPE:STRING=Release</string>
                   <string>-DWORD_SIZE:STRING=32</string>
                   <string>-DROOT_PROJECT_NAME:STRING=SecondLife</string>
-                  <string>-DINSTALL_PROPRIETARY=FALSE</string>
                   <string>-DUSE_PRECOMPILED_HEADERS=ON</string>
                   <string>-DLL_RELEASE_FOR_DOWNLOAD:BOOL=TRUE</string>
                 </array>