diff --git a/include/site/linux b/include/site/linux
index 492d1ddde1..b193d25c45 100644
--- a/include/site/linux
+++ b/include/site/linux
@@ -74,3 +74,5 @@ 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