diff --git a/include/patty/ax25/address.h b/include/patty/ax25/address.h
index c4afbbb..14f0af2 100644
--- a/include/patty/ax25/address.h
+++ b/include/patty/ax25/address.h
@@ -10,12 +10,12 @@
 typedef struct _patty_ax25_address {
     char callsign[7];
 
-    int ssid;
-    int last;
+    uint8_t ssid,
+            last;
 
     union {
-        int c;
-        int repeated;
+        uint8_t c,
+                repeated;
     };
 } patty_ax25_address;