diff --git a/asn1/utils/asn1tostruct.py b/asn1/utils/asn1tostruct.py
index 5586e40..0bba9dd 100755
--- a/asn1/utils/asn1tostruct.py
+++ b/asn1/utils/asn1tostruct.py
@@ -389,6 +389,8 @@
         iename = re.sub('id-', '', ie[0])
         ienameunderscore = lowerFirstCamelWord(re.sub('-', '_', iename))
         f.write("    ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_%s, &%s->%s);\n" % (ietypeunderscore, lowerFirstCamelWord(re.sub('-', '_', key)), ienameunderscore))
+
+    f.write("    return 0;\n")
     f.write("}\n\n")
 
 for key in iesDefs: