diff --git a/source/core/write-concern.txt b/source/core/write-concern.txt
index ed712680669..6731ee17c99 100644
--- a/source/core/write-concern.txt
+++ b/source/core/write-concern.txt
@@ -38,7 +38,7 @@ Read Isolation
 Timeouts
 ~~~~~~~~
 
-Clients can set a :ref:`wtimeout <wc-wtimeout>` value as part of a a
+Clients can set a :ref:`wtimeout <wc-wtimeout>` value as part of a
 :ref:`replica acknowledged <replica-set-write-concern>` write
 concern. If the write concern is not satisfied in the specified
 interval, the operation returns an error, even if the write concern