diff --git a/tests/gtest/avif_fuzztest_helpers.cc b/tests/gtest/avif_fuzztest_helpers.cc
index 307ce0cd91..e3022e2743 100644
--- a/tests/gtest/avif_fuzztest_helpers.cc
+++ b/tests/gtest/avif_fuzztest_helpers.cc
@@ -223,22 +223,9 @@ ::testing::Environment* SetEnv(const char* name, const char* value) {
 
 //------------------------------------------------------------------------------
 
-#ifdef TEST_DATA_DIRS
-// Helper macros to ensure TEST_DATA_DIRS is a quoted string.
-// NOTE: TEST_DATA_DIRS must NOT be a quoted string before stringification
-// otherwise it will be quoted twice, resulting in the use of an incorrect path.
-#define AVIF_TO_STRING(S) #S
-#define AVIF_STRINGIFY(S) AVIF_TO_STRING(S)
-#endif
-
 std::vector<std::string> GetSeedDataDirs() {
   const char* var = std::getenv("TEST_DATA_DIRS");
   std::vector<std::string> res;
-#ifdef TEST_DATA_DIRS
-  if (var == nullptr) {
-    var = AVIF_STRINGIFY(TEST_DATA_DIRS);
-  }
-#endif
   if (var == nullptr || *var == 0) return res;
   const char* var_start = var;
   while (true) {
@@ -252,9 +239,6 @@ std::vector<std::string> GetSeedDataDirs() {
   return res;
 }
 
-#undef AVIF_STRINGIFY
-#undef AVIF_TO_STRING
-
 std::vector<std::string> GetTestImagesContents(
     size_t max_file_size, const std::vector<avifAppFileFormat>& image_formats) {
   // Use an environment variable to get the test data directory because