diff --git a/ttcn/LibSip_SIPTypesAndValues.ttcn b/ttcn/LibSip_SIPTypesAndValues.ttcn
index bc375c45c62d44baffd81888f8502da0ff56666a..88ebc54502de3213e5421c54a11aba94b6f22134 100644
--- a/ttcn/LibSip_SIPTypesAndValues.ttcn
+++ b/ttcn/LibSip_SIPTypesAndValues.ttcn
@@ -194,7 +194,8 @@ module LibSip_SIPTypesAndValues {
 
             const ContentType c_empty_ContentType := {
                 fieldName := CONTENT_TYPE_E,
-                mTypeSubtype := ""
+                mTypeSubtype := "",
+                mParams := omit
             };
 
             const CSeq c_empty_cSeq := {