diff --git a/pandas/tseries/frequencies.py b/pandas/tseries/frequencies.py
index 4ed04b0d173fb5..aa33a3849acb3d 100644
--- a/pandas/tseries/frequencies.py
+++ b/pandas/tseries/frequencies.py
@@ -730,7 +730,6 @@ def get_standard_freq(freq):
 _period_code_map.update({
     "Q": 2000,  # Quarterly - December year end (default quarterly)
     "A": 1000,  # Annual
-    "Y": 1000,
     "W": 4000,  # Weekly
     "C": 5000,  # Custom Business Day
 })