1 files changed, 1 insertions, 1 deletions
diff --git a/linux/advent2020/4b.mu b/linux/advent2020/4b.mu
index 00e99eeb..2dc6c6a2 100644
--- a/linux/advent2020/4b.mu
+++ b/linux/advent2020/4b.mu
@@ -231,7 +231,7 @@ fn main -> _/ebx: int {
           var c/eax: (addr byte) <- index s3, i
           {
             var c2/eax: byte <- copy-byte *c
-            var valid?/eax: boolean <- is-hex-digit? c2
+            var valid?/eax: boolean <- hex-digit? c2
             compare valid?, 0
             loop-if-= $main:word-loop
           }