diff --git a/gprs_gb/Test.ttcn b/gprs_gb/Test.ttcn
index 88a78a8..33d43bf 100644
--- a/gprs_gb/Test.ttcn
+++ b/gprs_gb/Test.ttcn
@@ -9,7 +9,7 @@
 	function f_assert_prepr(in octetstring a, in octetstring b) {
 		log ("Input: ", a);
 		log ("Expected: ", b);
-		var octetstring a_preprocessed := f_BSSGP_preprocess_pdu(a);
+		var octetstring a_preprocessed := f_BSSGP_expand_len(a);
 		log ("Preprocessed: ", a_preprocessed);
 
 		if (a_preprocessed != b) {
@@ -21,7 +21,7 @@
 
 	function f_dec_and_log(in octetstring inp) {
 		log("Input: ", inp);
-		var octetstring inp_p := f_BSSGP_preprocess_pdu(inp);
+		var octetstring inp_p := f_BSSGP_expand_len(inp);
 		log ("Preprocessed: ", inp_p);
 		var BssgpPdu dec := dec_BssgpPdu(inp_p);
 		log("Decoded: ", dec);