diff --git a/lldb/utils/lldb-dotest/lldb-dotest.in b/lldb/utils/lldb-dotest/lldb-dotest.in
--- a/lldb/utils/lldb-dotest/lldb-dotest.in
+++ b/lldb/utils/lldb-dotest/lldb-dotest.in
@@ -20,7 +20,10 @@
     # Build dotest.py command.
     cmd = [sys.executable, dotest_path]
     cmd.extend(['--arch', arch])
-    cmd.extend(dotest_args)
+    # Don't stick empty args into the command, they will get interpreted as
+    # test path directories and override the default searching.
+    if len(dotest_args) > 0:
+        cmd.extend(dotest_args)
     cmd.extend(['--build-dir', lldb_build_dir])
     cmd.extend(['--executable', executable])
     cmd.extend(['--compiler', compiler])