1 files changed, 1 insertions, 1 deletions
diff --git a/common.mk b/common.mk
index c7d331f1df..09f7db271e 100644
--- a/common.mk
+++ b/common.mk
@@ -838,7 +838,7 @@ test-spec-precheck: main
 test-spec: $(TEST_RUNNABLE)-test-spec
 yes-test-spec: test-spec-precheck
 	$(gnumake_recursive)$(Q) \
-	$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec run -B $(srcdir)/spec/default.mspec $(MSPECOPT) $(SPECOPTS)
+	$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec run -B $(srcdir)/spec/default.mspec -I$(srcdir)/tool/lib $(MSPECOPT) $(SPECOPTS)
 no-test-spec:
 
 RUNNABLE = $(LIBRUBY_RELATIVE:no=un)-runnable