diff --git a/common.mk b/common.mk
index 873b6fb851..303edb4971 100644
--- a/common.mk
+++ b/common.mk
@@ -712,7 +712,7 @@ test-rubyspec-precheck: $(arch)-fake.rb
 test-rubyspec: $(TEST_RUNNABLE)-test-rubyspec
 yes-test-rubyspec: test-rubyspec-precheck
 	$(gnumake_recursive)$(Q) \
-	$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec run -B $(srcdir)/spec/default.mspec $(MSPECOPT)
+	$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec run $(MSPECOPT)
 no-test-rubyspec: test-rubyspec-precheck
 
 RUNNABLE = $(LIBRUBY_RELATIVE:no=un)-runnable