diff --git a/lib/libc/gen/sem_open.3 b/lib/libc/gen/sem_open.3
index f5ba249f126a..772bdfb70dac 100644
--- a/lib/libc/gen/sem_open.3
+++ b/lib/libc/gen/sem_open.3
@@ -168,7 +168,7 @@ argument is too long.
 The system limit on semaphores has been reached.
 .It Bq Er ENOENT
 .Dv O_CREAT
-is set but the named semaphore does not exist.
+is not set but the named semaphore does not exist.
 .It Bq Er ENOSPC
 There is not enough space to create the semaphore.
 .El