diff --git a/samples/mousetest.c b/samples/mousetest.c
index 13bc33f5a..7d9409659 100644
--- a/samples/mousetest.c
+++ b/samples/mousetest.c
@@ -30,6 +30,12 @@
 */
 #  undef DYN_DRV
 #  define DYN_DRV       0
+#else
+
+/* Use a dynamically loaded driver, by default. */
+#  ifndef DYN_DRV
+#    define DYN_DRV     1
+#  endif
 #endif