diff --git a/xmltest.cpp b/xmltest.cpp
index 59724f7..1c07faa 100644
--- a/xmltest.cpp
+++ b/xmltest.cpp
@@ -2017,6 +2017,8 @@
     {
         struct TestUtil: XMLVisitor
         {
+            TestUtil() : str() {}
+
             void TestParseError(const char *testString, const char *docStr, XMLError expected_error, int expectedLine)
             {
                 XMLDocument doc;