diff --git a/common.mk b/common.mk
index 55f3411046..da3f47f12b 100644
--- a/common.mk
+++ b/common.mk
@@ -1121,8 +1121,8 @@ preludes: {$(srcdir)}golf_prelude.c
 	$(ECHO) making $@
 	$(Q) $(BASERUBY) $(srcdir)/tool/mk_builtin_loader.rb $<
 
-builtin_binary.inc: $(PREP) $(BUILTIN_RB_SRCS) $(srcdir)/tool/mk_builtin_binary.rb
-	$(Q) $(MINIRUBY) $(srcdir)/tool/mk_builtin_binary.rb
+builtin_binary.inc: miniruby$(EXEEXT) $(BUILTIN_RB_SRCS) $(srcdir)/tool/mk_builtin_binary.rb
+	$(Q) ./miniruby$(EXEEXT) $(srcdir)/tool/mk_builtin_binary.rb
 
 $(BUILTIN_RB_INCS): $(top_srcdir)/tool/mk_builtin_loader.rb