diff --git a/Changelog.md b/Changelog.md
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,10 @@
+[0.11.5.2] — August 2023
+
+* Bug fixes:
+  * [Fix `clockid_t`-related build failures on some platforms](https://github.com/haskell/bytestring/pull/607)
+
+[0.11.5.2]: https://github.com/haskell/bytestring/compare/0.11.5.1...0.11.5.2
+
 [0.11.5.1] — August 2023
 
 * Bug fixes:
diff --git a/bytestring.cabal b/bytestring.cabal
--- a/bytestring.cabal
+++ b/bytestring.cabal
@@ -1,5 +1,5 @@
 Name:                bytestring
-Version:             0.11.5.1
+Version:             0.11.5.2
 Synopsis:            Fast, compact, strict and lazy byte strings with a list interface
 Description:
     An efficient compact, immutable byte string type (both strict and lazy)
diff --git a/cbits/is-valid-utf8.c b/cbits/is-valid-utf8.c
--- a/cbits/is-valid-utf8.c
+++ b/cbits/is-valid-utf8.c
@@ -50,7 +50,7 @@
 #endif
 
 #include <MachDeps.h>
-#include "Rts.h"
+#include "ghcplatform.h"
 
 #ifdef WORDS_BIGENDIAN
 #define to_little_endian(x) __builtin_bswap64(x)