diff --git a/scripts/build/libc/newlib.sh b/scripts/build/libc/newlib.sh
index b6161e04..709b6a2d 100644
--- a/scripts/build/libc/newlib.sh
+++ b/scripts/build/libc/newlib.sh
@@ -64,6 +64,8 @@ LITE_EXIT:lite-exit
 REENT_SMALL:newlib-reent-small
 MULTITHREAD:newlib-multithread
 WIDE_ORIENT:newlib-wide-orient
+FSEEK_OPTIMIZATION:newlib-fseek-optimization
+FVWRITE_IN_STREAMIO:newlib-fvwrite-in-streamio
 UNBUF_STREAM_OPT:newlib-unbuf-stream-opt
 ENABLE_TARGET_OPTSPACE:target-optspace
     "