--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -99,7 +99,6 @@ check_function_exists(_strtoi64 HAVE__STRTOI64)
 check_function_exists(_strtoui64 HAVE__STRTOUI64)
 check_function_exists(_unlink HAVE__UNLINK)
 check_function_exists(arc4random HAVE_ARC4RANDOM)
-check_function_exists(clonefile HAVE_CLONEFILE)
 check_function_exists(explicit_bzero HAVE_EXPLICIT_BZERO)
 check_function_exists(explicit_memset HAVE_EXPLICIT_MEMSET)
 check_function_exists(fchmod HAVE_FCHMOD)