diff --git a/configure.ac b/configure.ac
index 8a14d44..29e505b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -110,9 +110,7 @@ AC_TYPE_UINT8_T
 
 # Checks for library functions.
 AC_FUNC_FORK
-AC_FUNC_MALLOC
 AC_FUNC_MBRTOWC
-AC_FUNC_REALLOC
 AC_CHECK_FUNCS([gettimeofday setrlimit inet_ntoa iswprint memchr memset nl_langinfo posix_memalign setenv setlocale sigaction socket strchr strdup strerror strtol wcwidth])
 
 AC_SEARCH_LIBS([clock_gettime], [rt], [AC_DEFINE([HAVE_CLOCK_GETTIME], [1], [Define if clock_gettime is available.])])