diff --git a/jq_test.c b/jq_test.c
index b4674c81..2960162e 100644
--- a/jq_test.c
+++ b/jq_test.c
@@ -61,7 +61,7 @@ static void run_jq_tests() {
         printf("\n");
         pass = 0;
       }
-      jv as_string = jv_dump_string(jv_copy(expected), rand());
+      jv as_string = jv_dump_string(jv_copy(expected), rand() & ~JV_PRINT_COLOUR);
       jv reparsed = jv_parse_sized(jv_string_value(as_string), jv_string_length(jv_copy(as_string)));
       assert(jv_equal(jv_copy(expected), jv_copy(reparsed)));
       jv_free(as_string);