diff --git a/GNUmakefile b/GNUmakefile
index 6a2a2a9314538484c10c86e0a4c097d52b7c00b2..354da5e3c51a3830ebfbbcbcfe54615468016917 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -67,7 +67,7 @@ manual-html: asdf.texinfo
 	makeinfo --html asdf.texinfo
 
 asdf.html: asdf.texinfo
-	makeinfo --html --no-split --no-headers asdf.texinfo > asdf.html
+	makeinfo --html --no-split --no-headers -o asdf.html asdf.texinfo
 
 asdf.info: asdf.texinfo
 	makeinfo asdf.texinfo