diff --git a/library/PCUIF_CodecPort.ttcn b/library/PCUIF_CodecPort.ttcn
index 3d6ceac13..4b2a8ce93 100644
--- a/library/PCUIF_CodecPort.ttcn
+++ b/library/PCUIF_CodecPort.ttcn
@@ -26,9 +26,19 @@ private function PCUIF_to_UD(in PCUIF_send_data pin, out UD_send_data pout) {
 	pout.data := enc_PCUIF_Message(pin.data);
 } with { extension "prototype(fast)" };
 
+private function fix_padding(inout PCUIF_data data) {
+	data.data := substr(data.data, 0, data.len);
+}
+
 private function UD_to_PCUIF(in UD_send_data pin, out PCUIF_send_data pout) {
 	pout.id := pin.id;
 	pout.data := dec_PCUIF_Message(pin.data);
+
+	/* HACK: fix padding in decoded message. Due to a bug in TITAN, we
+	 * cannot just use its 'PADDING' attribute because it breaks decoding. */
+	if (ischosen(pout.data.u.data_req)) { fix_padding(pout.data.u.data_req); }
+	if (ischosen(pout.data.u.data_cnf)) { fix_padding(pout.data.u.data_cnf); }
+	if (ischosen(pout.data.u.data_ind)) { fix_padding(pout.data.u.data_ind); }
 } with { extension "prototype(fast)" };
 
 type port PCUIF_CODEC_PT message {