diff --git a/ext/psych/psych.gemspec b/ext/psych/psych.gemspec
index 8c81e56bd5..5f4bb43e0e 100644
--- a/ext/psych/psych.gemspec
+++ b/ext/psych/psych.gemspec
@@ -60,7 +60,7 @@ DESCRIPTION
       "lib/psych_jars.rb",
       "lib/psych.jar"
     ]
-    s.requirements = "jar org.yaml:snakeyaml, #{Psych::DEFAULT_SNAKEYAML_VERSION}"
+    s.requirements = "jar org.yaml:snakeyaml, #{version_module::Psych::DEFAULT_SNAKEYAML_VERSION}"
     s.add_dependency 'jar-dependencies', '>= 0.1.7'
   else
     s.extensions = ["ext/psych/extconf.rb"]