diff --git a/install.sh b/install.sh
index a343d98..1b58588 100755
--- a/install.sh
+++ b/install.sh
@@ -1,2 +1,7 @@
 #!/bin/sh
+if [ -z ${$PREFIX+x} ];
+then
+	PREFIX=/usr
+fi
+
 install editvorbis.sh $PREFIX/bin/editvorbis