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-rw-r--r--qpdf/test_driver.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/qpdf/test_driver.cc b/qpdf/test_driver.cc
index 462a8a23..d3abbe46 100644
--- a/qpdf/test_driver.cc
+++ b/qpdf/test_driver.cc
@@ -1631,7 +1631,7 @@ void runtest(int n, char const* filename1, char const* arg2)
QPDFFormFieldObjectHelper parent(node.getParent());
std::cout << " Parent: "
<< (parent.isNull()
- ? "none"
+ ? std::string("none")
: parent.getObjectHandle().unparse())
<< std::endl;
node = parent;