diff --git a/src/print.c b/src/print.c
index a0ab8f9..d3d849c 100644
--- a/src/print.c
+++ b/src/print.c
@@ -112,8 +112,17 @@ int patty_print_frame(FILE *fh,
             goto error_io;
         }
     } else if (PATTY_AX25_CONTROL_UNNUMBERED(frame->control)) {
-        if (fprintf(fh, " type U info %zu bytes",
-                frame->infolen) < 0) {
+        if (fprintf(fh, " type U") < 0) {
+            goto error_io;
+        }
+
+        if (PATTY_AX25_CONTROL_UNNUMBERED_INFO(frame->control)) {
+            if (fprintf(fh, " info %zu bytes", frame->infolen) < 0) {
+                goto error_io;
+            }
+        }
+    } else if (PATTY_AX25_CONTROL_SUPER(frame->control)) {
+        if (fprintf(fh, " type S") < 0) {
             goto error_io;
         }
     }