diff --git a/mlat/client/version.py b/mlat/client/version.py
index fb5fbe5..6175140 100644
--- a/mlat/client/version.py
+++ b/mlat/client/version.py
@@ -18,4 +18,4 @@
 
 """Just a version constant!"""
 
-CLIENT_VERSION = "0.3.5"
+CLIENT_VERSION = "0.3.6"
diff --git a/modes_message.c b/modes_message.c
index 29af1c8..7484272 100644
--- a/modes_message.c
+++ b/modes_message.c
@@ -396,7 +396,7 @@ static int decode(modesmessage *self)
     }
 
     if (self->df != 0 && self->df != 4 && self->df != 5 && self->df != 11 &&
-        self->df != 16 && self->df != 17 && self->df != 18 && self->df != 20 && self->df != 21) {
+        self->df != 16 && self->df != 17 && self->df != 20 && self->df != 21) {
         /* we do not know how to handle this message type, no further processing */
         return 0;
     }
@@ -432,7 +432,6 @@ static int decode(modesmessage *self)
         break;
 
     case 17:
-    case 18:
         self->valid = (crc == 0);
         if (self->valid) {
             unsigned metype;