diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index d17c996..02deb7c 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -4794,7 +4794,7 @@
 
 # Iran had a sub-minute UTC offset before 1946.
 class IranTest(ZoneInfoTest):
-    zonename = 'Iran'
+    zonename = 'Asia/Tehran'
 
 def load_tests(loader, standard_tests, pattern):
     standard_tests.addTest(ZoneInfoCompleteTest())