diff --git a/lib/libc/printf.c b/lib/libc/printf.c
index 2715a72..45e153e 100644
--- a/lib/libc/printf.c
+++ b/lib/libc/printf.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -108,6 +108,9 @@
 			/* Check the format specifier */
 loop:
 			switch (*fmt) {
+			case '%':
+				(void)putchar('%');
+				break;
 			case 'i': /* Fall through to next one */
 			case 'd':
 				num = get_num_va_args(args, l_count);