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-rw-r--r--Drivers.macros2
1 files changed, 1 insertions, 1 deletions
diff --git a/Drivers.macros b/Drivers.macros
index 054e521..fe0e216 100644
--- a/Drivers.macros
+++ b/Drivers.macros
@@ -45,7 +45,7 @@ AC_DEFUN(AC_DRIVER, [
AC_ARG_ENABLE([$1],,
AC_DEFINE([$2])
device_drivers="$device_drivers [$3]"
-if test "driver_class_[$4]_selected+set" != set; then
+if test "${driver_class_[$4]_selected+set}" != set; then
driver_class_[$4]_selected=yes
AC_DEFINE_UNQUOTED($driver_class_[$4]_option)
device_drivers="$device_drivers $driver_class_[$4]_files"