diff --git a/configure.ac b/configure.ac
index 04f070a8..2fb844d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,5 +29,5 @@ AC_OUTPUT(Makefile \
 	usr/share/man/man1/Makefile usr/bin/Makefile)
 
 if test -n "${prefix}" && test "${prefix}" != "/usr"; then
-	sed -i "s:export BYOBU_PREFIX=\"/usr\"$:BYOBU_PREFIX=\"${prefix}\":" usr/bin/byobu-janitor usr/bin/byobu-launcher usr/bin/byobu-select-profile usr/bin/byobu-status usr/bin/byobu
+	sed -i "s: \&\& export BYOBU_PREFIX=.*$: \&\& export BYOBU_PREFIX=\"${prefix}\":" usr/bin/byobu-janitor usr/bin/byobu-launcher usr/bin/byobu-select-profile usr/bin/byobu-status usr/bin/byobu
 fi