diff --git a/src/ruby/tools/platform_check.rb b/src/ruby/tools/platform_check.rb
index e891ec23a81..c058deb5f5c 100644
--- a/src/ruby/tools/platform_check.rb
+++ b/src/ruby/tools/platform_check.rb
@@ -46,7 +46,7 @@ module PLATFORM
     case RbConfig::CONFIG['host_cpu']
       when /x86_64/
         'x86_64'
-      when /x86|i686/
+      when /x86|i686|i386/
         'x86'
       else
         fail 'cpu architecture detection failed'