diff --git a/lib/libmagic/Makefile b/lib/libmagic/Makefile
index d341a3a5f564..59d772df552f 100644
--- a/lib/libmagic/Makefile
+++ b/lib/libmagic/Makefile
@@ -32,7 +32,7 @@ MAGFILES=	${CONTRDIR}/Header\
 		${CONTRDIR}/Magdir/[a-z]*
 
 magic: ${MAGFILES}
-	cat ${.ALLSRC} > ${.TARGET}
+	cat ${.ALLSRC:O} > ${.TARGET}
 
 magic.mgc: mkmagic magic
 	./mkmagic magic