diff --git a/share/man/man9/sysctl.9 b/share/man/man9/sysctl.9
index 83f526b349a..2a4370a5d67 100644
--- a/share/man/man9/sysctl.9
+++ b/share/man/man9/sysctl.9
@@ -704,7 +704,7 @@ macro or the
 function.
 If the
 .Fa len
-argument in zero, the string length is computed at every access to the OID using
+argument is zero, the string length is computed at every access to the OID using
 .Xr strlen 3 .
 Use the
 .Fn SYSCTL_CONST_STRING