diff --git a/tests/125-bitstring-constraint-OK.asn1.-X b/tests/125-bitstring-constraint-OK.asn1.-X
new file mode 100644
index 0000000..64a21c4
--- /dev/null
+++ b/tests/125-bitstring-constraint-OK.asn1.-X
@@ -0,0 +1,8 @@
+<!-- XML DTD generated by asn1c-0.9.22 -->
+
+<!-- ASN.1 module
+ModuleBitStringConstraint { iso org(3) dod(6) internet(1) private(4)
+	enterprise(1) spelio(9363) software(1) asn1c(5) test(1) 125 }
+found in ../tests/125-bitstring-constraint-OK.asn1 -->
+
+<!ELEMENT T (flag1?, flag2?, flag3?)>