diff --git a/src/libthread/mkfile b/src/libthread/mkfile
index 1e257b3e..e77517a8 100644
--- a/src/libthread/mkfile
+++ b/src/libthread/mkfile
@@ -1,7 +1,6 @@
 <$PLAN9/src/mkhdr
 
 SYSOFILES=`{sh ./sysofiles.sh}
-x=`{echo $SYSOFILES> xx}
 LIB=libthread.a
 OFILES=\
 	$SYSOFILES\