diff --git a/doc/src/base/constants.md b/doc/src/base/constants.md
index 4ba0e627b0c54..14ddbc02698d0 100644
--- a/doc/src/base/constants.md
+++ b/doc/src/base/constants.md
@@ -23,6 +23,3 @@ See also:
   * [`stderr`](@ref)
   * [`ENV`](@ref)
   * [`ENDIAN_BOM`](@ref)
-  * `Libc.MS_ASYNC`
-  * `Libc.MS_INVALIDATE`
-  * `Libc.MS_SYNC`