1 files changed, 6 insertions, 5 deletions
diff --git a/src/lib9/fmt/dofmt.c b/src/lib9/fmt/dofmt.c
index 214b71db..353c76e3 100644
--- a/src/lib9/fmt/dofmt.c
+++ b/src/lib9/fmt/dofmt.c
@@ -605,12 +605,13 @@ __flagfmt(Fmt *f)
 int
 __badfmt(Fmt *f)
 {
-	char x[3];
+	char x[2+UTFmax];
+	int n;
 
 	x[0] = '%';
-	x[1] = f->r;
-	x[2] = '%';
-	f->prec = 3;
-	__fmtcpy(f, (const void*)x, 3, 3);
+	n = 1 + runetochar(x+1, &f->r);
+	x[n++] = '%';
+	f->prec = n;
+	__fmtcpy(f, (const void*)x, n, n);
 	return 0;
 }