diff --git a/src/validators/domain.py b/src/validators/domain.py
index 5a85a59..23ae263 100644
--- a/src/validators/domain.py
+++ b/src/validators/domain.py
@@ -29,7 +29,7 @@ def check(cls, tld: str):
         if tld in cls._popular_cache:
             return True
         if cls._full_cache is None:
-            if environ.get("PYVLD_CACHE_TLD", "False") == "True":
+            if environ.get("PYVLD_CACHE_TLD") == "True":
                 cls._full_cache = set(cls._retrieve())
             else:
                 return tld in cls._retrieve()