diff --git a/template/fake.rb.in b/template/fake.rb.in
index 7af17fa344..aead377ed8 100644
--- a/template/fake.rb.in
+++ b/template/fake.rb.in
@@ -18,6 +18,7 @@ if inc = arg['i']
     version[n] = src.value(v)
   end
   arg['RUBY_DESCRIPTION_WITH_MJIT'] = src.value('description_with_mjit')
+  arg['RUBY_DESCRIPTION_WITH_YJIT'] = src.value('description_with_yjit')
 end
 %>baseruby="<%=arg['BASERUBY']%>"
 _\
@@ -34,9 +35,14 @@ class Object
   CROSS_COMPILING = RUBY_PLATFORM
   constants.grep(/^RUBY_/) {|n| remove_const n}
 % arg['versions'].each {|n, v|
-  <%=n%> = <%if n=='RUBY_DESCRIPTION' %>RubyVM.const_defined?(:JIT) && RubyVM::MJIT.enabled? ?
-    <%=arg['RUBY_DESCRIPTION_WITH_JIT'].inspect%> :
-    <%end%><%=v.inspect%>
+  <%=n%> = <%if n=='RUBY_DESCRIPTION' %>case
+    when RubyVM.const_defined?(:MJIT) && RubyVM::MJIT.enabled?
+      <%=arg['RUBY_DESCRIPTION_WITH_MJIT'].inspect%>
+    when RubyVM.const_defined?(:YJIT) && RubyVM::YJIT.enabled?
+      <%=arg['RUBY_DESCRIPTION_WITH_YJIT'].inspect%>
+    else
+      <%=v.inspect%>
+    end<%else%><%=v.inspect%><%end%>
 % }
 end
 builddir = File.dirname(File.expand_path(__FILE__))