diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -102,5 +102,5 @@
-  if(gz_msgs_protoc_GENERATE_RUBY)
+  if(0)
     file(MAKE_DIRECTORY ${gz_msgs_protoc_OUTPUT_RUBY_DIR})
     set(output_ruby "${gz_msgs_protoc_OUTPUT_RUBY_DIR}${proto_package_dir}/${FIL_WE}_pb.rb")
     list(APPEND ${gz_msgs_protoc_OUTPUT_RUBY_VAR} ${output_ruby})
     list(APPEND output_files ${output_ruby})
@@ -126,5 +126,5 @@
-  if(${gz_msgs_protoc_GENERATE_RUBY})
+  if(0)
     list(APPEND GENERATE_ARGS
       --generate-ruby
       --output-ruby-path "${gz_msgs_protoc_OUTPUT_RUBY_DIR}")
   endif()