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-rw-r--r--ext/sleepy_penguin/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/sleepy_penguin/extconf.rb b/ext/sleepy_penguin/extconf.rb
index e07f5d2..f11f9c1 100644
--- a/ext/sleepy_penguin/extconf.rb
+++ b/ext/sleepy_penguin/extconf.rb
@@ -34,4 +34,5 @@ have_func('rb_thread_fd_close')
 have_func('rb_update_max_fd')
 have_func('rb_fd_fix_cloexec')
 have_func('rb_io_get_io')
+have_func('rb_struct_size')
 create_makefile('sleepy_penguin_ext')