diff --git a/indra/cmake/Prebuilt.cmake b/indra/cmake/Prebuilt.cmake
index 33a6d769167542a4294b4f8abbb017a0e5e2af93..98adc330948003c4d4958f4b535fe9587e80774b 100644
--- a/indra/cmake/Prebuilt.cmake
+++ b/indra/cmake/Prebuilt.cmake
@@ -45,6 +45,7 @@ macro (use_prebuilt_binary _binary)
       endif(DEBUG_PREBUILT)
       execute_process(COMMAND "${AUTOBUILD_EXECUTABLE}"
         install
+        -A${ADDRESS_SIZE}
         --install-dir=${AUTOBUILD_INSTALL_DIR}
         ${_binary}
         WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"