diff --git a/extra/lvm2/build b/extra/lvm2/build
index 939872f3..ffa71785 100755
--- a/extra/lvm2/build
+++ b/extra/lvm2/build
@@ -7,7 +7,7 @@ patch -p1 < disable-symver.patch
 # Busybox doesn't provide this command, however
 # all it does is split words one per line and
 # 'tr' can be used in its place.
-sed -i'' 's/fmt -1/tr " " "\\n"/' \
+sed -i 's/fmt -1/tr " " "\\n"/' \
     make.tmpl.in libdm/make.tmpl.in
 
 # The build fails when using busybox's 'mkdir'(?),