diff --git a/vars/build.vars b/vars/build.vars
index bb52dbc..e77a097 100644
--- a/vars/build.vars
+++ b/vars/build.vars
@@ -7,6 +7,7 @@ ac_cv_func_chown_works=yes
 ac_cv_func_getgroups_works=yes
 ac_cv_func_malloc_0_nonnull=yes
 ac_cv_func_mmap_fixed_mapped=yes
+ac_cv_func_realloc_0_nonnull=yes
 ac_cv_func_strcoll_works=yes
 ac_cv_func_strnlen_working=yes
 ac_cv_func_working_mktime=yes