diff --git a/meta/site/common-glibc b/meta/site/common-glibc
index dc69703eec..8329bb3e15 100644
--- a/meta/site/common-glibc
+++ b/meta/site/common-glibc
@@ -80,3 +80,6 @@ ac_cv_va_copy=${ac_cv_va_copy=yes}
 ac_cv___va_copy=${ac_cv___va_copy=yes}
 ac_cv_func_va_copy=${ac_cv_func_va_copy=yes}
 ac_cv_func___va_copy=${ac_cv_func___va_copy=yes}
+
+# Xorg
+xorg_cv_malloc0_returns_null=${xorg_cv_malloc0_returns_null=yes}
diff --git a/meta/site/common-uclibc b/meta/site/common-uclibc
index 0e3fde056d..26fc103319 100644
--- a/meta/site/common-uclibc
+++ b/meta/site/common-uclibc
@@ -47,3 +47,6 @@ ac_cv_func___va_copy=${ac_cv_func___va_copy=yes}
 ac_cv_func_posix_getpwuid_r=${ac_cv_func_posix_getpwuid_r=yes}
 ac_cv_func_posix_getgrgid_r=${ac_cv_func_posix_getgrgid_r=yes}
 ac_cv_func_posix_getpwnam_r=${ac_cv_func_posix_getpwnam_r=yes}
+
+# Xorg
+xorg_cv_malloc0_returns_null=${xorg_cv_malloc0_returns_null=yes}