diff --git a/clang-tools-extra/test/Makefile b/clang-tools-extra/test/Makefile
index 1dcf7cd27c14..74d0e6fb745a 100644
--- a/clang-tools-extra/test/Makefile
+++ b/clang-tools-extra/test/Makefile
@@ -60,6 +60,7 @@ lit.site.cfg: FORCE
 Unit/lit.site.cfg: FORCE
 	@echo "Making Unit/lit.site.cfg for Clang extra tools..."
 	@$(MKDIR) $(dir $@)
+	@$(ECHOPATH) s=@LLVM_LIBS_DIR@=$(LibDir)=g >> lit.tmp
 	@$(ECHOPATH) s=@CLANG_TOOLS_BINARY_DIR@=$(PROJ_OBJ_DIR)/..=g >> lit.tmp
 	@$(ECHOPATH) s=@TARGET_TRIPLE@=$(TARGET_TRIPLE)=g >> lit.tmp
 	@$(ECHOPATH) s=@CLANG_TOOLS_SOURCE_DIR@=$(PROJ_SRC_DIR)/..=g >> lit.tmp