diff --git a/configure.ac b/configure.ac
index 28b0cacf..c8e00a23 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,6 +28,6 @@ AC_OUTPUT(Makefile \
 	usr/lib/byobu/Makefile \
 	usr/share/man/man1/Makefile usr/bin/Makefile)
 
-if [ -n "${prefix}" ] && [ "${prefix}" != "/usr"]; then
+if test -n "${prefix}" && test "${prefix}" != "/usr"; then
 	sed -i "s: && export BYOBU_PREFIX=\"/usr\": && export BYOBU_PREFIX=\"${prefix}\":g" usr/bin/byobu-janitor usr/bin/byobu-launcher usr/bin/byobu-select-profile usr/bin/byobu-status usr/bin/byobu
 fi