diff --git a/library/GSM_SystemInformation.ttcn b/library/GSM_SystemInformation.ttcn
index 90fa425..b53d5f2 100644
--- a/library/GSM_SystemInformation.ttcn
+++ b/library/GSM_SystemInformation.ttcn
@@ -7,6 +7,7 @@
 
 	import from General_Types all;
 	import from GSM_Types all;
+	import from GSM_RR_Types all;
 	import from Osmocom_Types all;
 
 	type union ArfcnOrMaio {