1 files changed, 1 insertions, 1 deletions
diff --git a/src/commonmark.c b/src/commonmark.c
index a9ba566..95a1ae5 100644
--- a/src/commonmark.c
+++ b/src/commonmark.c
@@ -93,7 +93,7 @@ static int shortest_unused_backtick_sequence(const char *code) {
       current++;
     } else {
       if (current > 0 && current < 32) {
-        used |= (1 << current);
+        used |= (1U << current);
       }
       current = 0;
     }