diff --git a/base/include/android-base/test_utils.h b/base/include/android-base/test_utils.h
index 07a5edd..4cfa06b 100644
--- a/base/include/android-base/test_utils.h
+++ b/base/include/android-base/test_utils.h
@@ -24,6 +24,7 @@
 class TemporaryFile {
  public:
   TemporaryFile();
+  explicit TemporaryFile(const std::string& tmp_dir);
   ~TemporaryFile();
 
   // Release the ownership of fd, caller is reponsible for closing the
diff --git a/base/test_utils.cpp b/base/test_utils.cpp
index 1cfa9e6..9d8dfb2 100644
--- a/base/test_utils.cpp
+++ b/base/test_utils.cpp
@@ -84,6 +84,10 @@
   init(GetSystemTempDir());
 }
 
+TemporaryFile::TemporaryFile(const std::string& tmp_dir) {
+  init(tmp_dir);
+}
+
 TemporaryFile::~TemporaryFile() {
   if (fd != -1) {
     close(fd);