diff --git a/common.mk b/common.mk
index 28ffb98af3..164d927970 100644
--- a/common.mk
+++ b/common.mk
@@ -857,7 +857,7 @@ test-spec: $(TEST_RUNNABLE)-test-spec
 yes-test-spec: test-spec-precheck
 	$(ACTIONS_GROUP)
 	$(gnumake_recursive)$(Q) \
-	$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec run -B $(srcdir)/spec/default.mspec -I$(srcdir)/tool/lib $(MSPECOPT) $(SPECOPTS)
+	$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec run -B $(srcdir)/spec/default.mspec $(MSPECOPT) $(SPECOPTS)
 	$(ACTIONS_ENDGROUP)
 no-test-spec: