diff --git a/CMake/unix-cache.cmake b/CMake/unix-cache.cmake
index 5a58d14d2d..fac54cd0fb 100644
--- a/CMake/unix-cache.cmake
+++ b/CMake/unix-cache.cmake
@@ -242,8 +242,8 @@ set(HAVE_SOCKET 1)
 set(HAVE_SOCKETPAIR 1)
 set(HAVE_STDATOMIC_H 1)
 set(HAVE_STDBOOL_H 1)
-set(HAVE_STDDEF_H 1)
-set(HAVE_STDINT_H 1)
+set(HAVE_STDDEF_H 1)  # detected by CMake internally in check_type_size()
+set(HAVE_STDINT_H 1)  # detected by CMake internally in check_type_size()
 set(HAVE_STRCASECMP 1)
 set(HAVE_STRCMPI 0)
 set(HAVE_STRDUP 1)