diff --git a/library/BSSMAP_Templates.ttcn b/library/BSSMAP_Templates.ttcn
index 22fefdd..54e3f79 100644
--- a/library/BSSMAP_Templates.ttcn
+++ b/library/BSSMAP_Templates.ttcn
@@ -449,7 +449,7 @@
 }
 
 private function f_enc_mcc_mnc(GsmMcc mcc, GsmMnc mnc) return OCT3 {
-	return hex2oct(mcc[1] & mcc[0] & mnc[0] & mnc[3] & mnc[2]);
+	return hex2oct(mcc[1] & mcc[0] & mnc[0] & mnc[2] & mnc[1]);
 }
 
 template BSSMAP_FIELD_CellIdentification_CGI ts_BSSMAP_CI_CGI(GsmMcc mcc, GsmMnc mnc, GsmLac lac, GsmCellId ci) := {