diff --git a/configure.ac b/configure.ac
index 02a4a8973fcaa2c7aaf50ce550ed6e5d4a043349..8c3ab20295b22a339150afc28289dfa93eea7471 100644
--- a/configure.ac
+++ b/configure.ac
@@ -76,8 +76,7 @@ GTK_DOC_CHECK([1.15],[--flavour no-tmpl])
 	AM_CONDITIONAL([ENABLE_GTK_DOC], false)
 ])
 
-# Types, functions, and headers
-AC_CHECK_TYPES(unsigned __int128)
+# Functions, and headers
 AC_CHECK_FUNCS(atexit mprotect sysconf getpagesize mmap isatty newlocale strtod_l setlinebuf)
 AC_CHECK_HEADERS(unistd.h sys/mman.h xlocale.h)