diff --git a/pkgs/misc/sane-backends/builder.sh b/pkgs/misc/sane-backends/builder.sh
index 4ecd717f0a43..f3edf124ec82 100644
--- a/pkgs/misc/sane-backends/builder.sh
+++ b/pkgs/misc/sane-backends/builder.sh
@@ -1,7 +1,7 @@
 source $stdenv/setup
 
 postInstall() {
-  if test $hotplugSupport = "1" ; then
+  if test "$hotplugSupport" = "1" ; then
     ensureDir $out/etc/hotplug/usb/
     cp tools/hotplug/* $out/etc/hotplug/usb/
   fi