diff --git a/lib/test_printf.c b/lib/test_printf.c
index cea592f402ed..b2aa8f514844 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -260,6 +260,13 @@ plain(void)
 {
 	int err;
 
+	/*
+	 * Make sure crng is ready. Otherwise we get "(ptrval)" instead
+	 * of a hashed address when printing '%p' in plain_hash() and
+	 * plain_format().
+	 */
+	wait_for_random_bytes();
+
 	err = plain_hash();
 	if (err) {
 		pr_warn("plain 'p' does not appear to be hashed\n");