diff --git a/src/pptx/enum/dml.py b/src/pptx/enum/dml.py
index 40d5c5cdf..46c4eca92 100644
--- a/src/pptx/enum/dml.py
+++ b/src/pptx/enum/dml.py
@@ -250,7 +250,7 @@ class MSO_PATTERN_TYPE(BaseXmlEnum):
     PERCENT_30 = (5, "pct30", "30% of the foreground color.")
     """30% of the foreground color."""
 
-    ERCENT_40 = (6, "pct40", "40% of the foreground color.")
+    PERCENT_40 = (6, "pct40", "40% of the foreground color.")
     """40% of the foreground color."""
 
     PERCENT_5 = (1, "pct5", "5% of the foreground color.")