diff --git a/srv/format.c b/srv/format.c
index ec4de76..baa122b 100644
--- a/srv/format.c
+++ b/srv/format.c
@@ -121,6 +121,7 @@ static uint32_t render_format(FormatCallback callback, void* arg,
 						zero_padding = true;
 						continue;
 					}
+					// fall through
 				case '1':
 				case '2':
 				case '3':