diff --git a/mlir/test/lit.cfg.py b/mlir/test/lit.cfg.py
--- a/mlir/test/lit.cfg.py
+++ b/mlir/test/lit.cfg.py
@@ -51,6 +51,7 @@
 config.test_exec_root = os.path.join(config.mlir_obj_root, 'test')
 
 # Tweak the PATH to include the tools dir.
+llvm_config.with_environment('PATH', config.mlir_tools_dir, append_path=True)
 llvm_config.with_environment('PATH', config.llvm_tools_dir, append_path=True)
 
 tool_dirs = [config.mlir_tools_dir, config.llvm_tools_dir]