1 files changed, 6 insertions, 0 deletions
diff --git a/sys/libn/io.c b/sys/libn/io.c
index 789bc7b..922dec3 100644
--- a/sys/libn/io.c
+++ b/sys/libn/io.c
@@ -25,6 +25,12 @@ io·getbyte(Stream *s)
     return fgetc(s);
 }
 
+error
+io·ungetbyte(Stream *s, byte c)
+{
+    return ungetc(c, s);
+}
+
 vlong
 io·read(Stream *s, int sz, int n, void *buf)
 {