diff --git a/ext/racc/cparse/extconf.rb b/ext/racc/cparse/extconf.rb
index 3b4f594b9d..18c5689ad8 100644
--- a/ext/racc/cparse/extconf.rb
+++ b/ext/racc/cparse/extconf.rb
@@ -3,6 +3,7 @@
 
 require 'mkmf'
 
+have_func('rb_block_call')
 have_func('rb_ary_subseq')
 
 create_makefile 'racc/cparse'