1 files changed, 1 insertions, 0 deletions
diff --git a/ruby.h b/ruby.h
index 76ea5d8b7c..ae8a661f54 100644
--- a/ruby.h
+++ b/ruby.h
@@ -575,6 +575,7 @@ RUBY_EXTERN VALUE rb_cIO;
 RUBY_EXTERN VALUE rb_cModule;
 RUBY_EXTERN VALUE rb_cNilClass;
 RUBY_EXTERN VALUE rb_cNumeric;
+RUBY_EXTERN VALUE rb_cBlock;
 RUBY_EXTERN VALUE rb_cProc;
 RUBY_EXTERN VALUE rb_cRange;
 RUBY_EXTERN VALUE rb_cRegexp;