diff --git a/extra/opendoas/build b/extra/opendoas/build
index ad56c468..3f2d4de7 100755
--- a/extra/opendoas/build
+++ b/extra/opendoas/build
@@ -1,6 +1,7 @@
 #!/bin/sh -e
 
-sed -i '/chown/d' GNUmakefile
+sed '/chown/d' GNUmakefile > _
+mv -f _ GNUmakefile
 
 ./configure \
     --prefix=/usr \