diff --git a/target/host-m32.rb b/target/host-m32.rb
index d1cddc907..39b2c952f 100644
--- a/target/host-m32.rb
+++ b/target/host-m32.rb
@@ -11,4 +11,5 @@ MRuby::Build.new do |conf|
   # Turn on `enable_debug` for better debugging
   enable_debug
   conf.enable_test
+  conf.enable_bintest
 end