diff --git a/src/kiss.c b/src/kiss.c
index 8635240..0d700c3 100644
--- a/src/kiss.c
+++ b/src/kiss.c
@@ -104,7 +104,7 @@ error_io:
 
 ssize_t patty_kiss_tnc_decode(patty_kiss_tnc *tnc, void *frame, size_t *len, int *port) {
     size_t i, b;
-    int flags = KISS_NONE;
+    enum kiss_flags flags = KISS_NONE;
 
     /*
      * The default port is always zero, unless a command byte issued from the