diff --git a/src/librustc_error_codes/error_codes/E0164.md b/src/librustc_error_codes/error_codes/E0164.md
index 8eb5ace4fe4d..48bb6f4b3828 100644
--- a/src/librustc_error_codes/error_codes/E0164.md
+++ b/src/librustc_error_codes/error_codes/E0164.md
@@ -22,7 +22,7 @@ fn bar(foo: A) {
 ```
 
 This error means that an attempt was made to match something which is neither a
-tuple struct nor a tuple variant. Only these two elements are allowed as
+tuple struct nor a tuple variant. Only these two elements are allowed as a
 pattern:
 
 ```