diff --git a/plugins/ruby/CMakeLists.txt b/plugins/ruby/CMakeLists.txt
index f1ef12ac..0976e18a 100644
--- a/plugins/ruby/CMakeLists.txt
+++ b/plugins/ruby/CMakeLists.txt
@@ -1,5 +1,5 @@
 # Allow build system to turn off downloading of libruby.so.
-OPTION(DOWNLOAD_RUBY "Download prebuilt libruby.so for ruby plugin." ON)
+OPTION(DOWNLOAD_RUBY "Download prebuilt libruby.so for ruby plugin." OFF)
 
 IF (DOWNLOAD_RUBY)