diff --git a/lib/printfmt.c b/lib/printfmt.c
index 802adcd..b1de635 100644
--- a/lib/printfmt.c
+++ b/lib/printfmt.c
@@ -205,11 +205,9 @@ vprintfmt(void (*putch)(int, void*), void *putdat, const char *fmt, va_list ap)
 
 		// (unsigned) octal
 		case 'o':
-			// LAB 1: Replace this with your code.
-			putch('X', putdat);
-			putch('X', putdat);
-			putch('X', putdat);
-			break;
+			num = getuint(&ap, lflag);
+			base = 8;
+			goto number;
 
 		// pointer
 		case 'p':