diff --git a/doc/man/man5/slapd.overlays.5 b/doc/man/man5/slapd.overlays.5
index 54dc0750ed..3e02d59d89 100644
--- a/doc/man/man5/slapd.overlays.5
+++ b/doc/man/man5/slapd.overlays.5
@@ -39,7 +39,7 @@ requested by the client.
 .B constraint
 Constraint.
 This overlay enforces a regular expression constraint on all values
-of specified attributes. It is used to enforce a more rigourous
+of specified attributes. It is used to enforce a more rigorous
 syntax when the underlying attribute syntax is too general.
 .TP
 .B dds