diff --git a/src/frame.c b/src/frame.c
index ef8d03f..fdd9ffb 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -128,7 +128,7 @@ static ssize_t decode_address(patty_ax25_frame *frame,
     if (PATTY_AX25_ADDRESS_SSID_C(frame->src.ssid)) {
         frame->cr      = PATTY_AX25_FRAME_RESPONSE;
         frame->version = PATTY_AX25_ADDRESS_SSID_C(frame->dest.ssid)?
-            PATTY_AX25_OLD: PATTY_AX25_2_0;
+            PATTY_AX25_2_0: PATTY_AX25_OLD;
     } else {
         frame->cr      = PATTY_AX25_FRAME_COMMAND;
         frame->version = PATTY_AX25_ADDRESS_SSID_C(frame->src.ssid)?