diff --git a/archiver/xz/xz.conf b/archiver/xz/xz.conf
index 4f167b814..55c88c077 100644
--- a/archiver/xz/xz.conf
+++ b/archiver/xz/xz.conf
@@ -14,5 +14,4 @@
 
 var_append GCC_WRAPPER_APPEND ' ' '-std=gnu99'
 var_append SYSGCC_WRAPPER_APPEND ' ' '-std=gnu99'
-export CC="$CC -std=gnu99"
 var_append confopt ' ' ' --disable-lzmadec --disable-lzmainfo --disable-lzma-links'
diff --git a/archiver/xz/xz.desc b/archiver/xz/xz.desc
index 6cb03cc3d..a6380b261 100644
--- a/archiver/xz/xz.desc
+++ b/archiver/xz/xz.desc
@@ -28,6 +28,8 @@
 
 [C] extra/tool
 
+[F] GNU99
+
 [L] PublicDomain
 [S] Stable
 [V] 5.2.2