diff --git a/lib/sbi/sbi_console.c b/lib/sbi/sbi_console.c
index 20fe65a..4229e7e 100644
--- a/lib/sbi/sbi_console.c
+++ b/lib/sbi/sbi_console.c
@@ -288,6 +288,10 @@ static int print(char **out, u32 *out_len, const char *format, va_list args)
 				case '0':
 					flags |= PAD_ZERO;
 					break;
+				case ' ':
+				case '\'':
+					/* Ignored flags, do nothing */
+					break;
 				default:
 					flags_done = true;
 					break;