diff --git a/xorg/st/build b/xorg/st/build
index 53074cc3..5d15e0cf 100755
--- a/xorg/st/build
+++ b/xorg/st/build
@@ -1,6 +1,7 @@
 #!/bin/sh -e
 
-sed -i 's|Liberation Mono|Monospace|g' config.def.h
+sed 's/Liberation Mono/Monospace/g' config.def.h > _
+mv -f _ config.def.h
 
 make
 make PREFIX=/usr DESTDIR="$1" install