diff --git a/tools/mrbc/mrbc.c b/tools/mrbc/mrbc.c
index 5382b90a8..62bc34700 100644
--- a/tools/mrbc/mrbc.c
+++ b/tools/mrbc/mrbc.c
@@ -212,3 +212,8 @@ void
 mrb_init_mrblib(mrb_state *mrb)
 {
 }
+
+void
+mrb_init_mrbgems(mrb_state *mrb)
+{
+}