diff --git a/include/site/linux b/include/site/linux
index 3173ccf9b..7595a647b 100644
--- a/include/site/linux
+++ b/include/site/linux
@@ -72,3 +72,5 @@ ac_cv_ushort=yes
 ac_cv_va_copy=C99
 ac_cv_va_val_copy=yes
 as_cv_unaligned_access=yes
+ac_cv_func_malloc_0_nonnull=yes
+ac_cv_func_realloc_0_nonnull=yes