1 files changed, 1 insertions, 0 deletions
diff --git a/ruby.h b/ruby.h
index 179a1ea15c..6cb3143e47 100644
--- a/ruby.h
+++ b/ruby.h
@@ -712,6 +712,7 @@ RUBY_EXTERN VALUE rb_cTrueClass;
 RUBY_EXTERN VALUE rb_cUnboundMethod;
 RUBY_EXTERN VALUE rb_cISeq;
 RUBY_EXTERN VALUE rb_cVM;
+RUBY_EXTERN VALUE rb_cEnv;
 
 RUBY_EXTERN VALUE rb_eException;
 RUBY_EXTERN VALUE rb_eStandardError;