diff --git a/libqpdf/QPDFJob.cc b/libqpdf/QPDFJob.cc
index 3748701..c9e91a1 100644
--- a/libqpdf/QPDFJob.cc
+++ b/libqpdf/QPDFJob.cc
@@ -464,7 +464,7 @@ QPDFJob::createQPDF()
     if (m->remove_info) {
         auto trailer = pdf.getTrailer();
         auto mod_date = trailer.getKey("/Info").getKeyIfDict("/ModDate");
-        if (mod_date.isNull()) {
+        if (mod_date.null()) {
             trailer.removeKey("/Info");
         } else {
             auto info = trailer.replaceKeyAndGetNew(
@@ -2064,7 +2064,7 @@ static void
 maybe_set_pagemode(QPDF& pdf, std::string const& pagemode)
 {
     auto root = pdf.getRoot();
-    if (root.getKey("/PageMode").isNull()) {
+    if (root.getKey("/PageMode").null()) {
         root.replaceKey("/PageMode", QPDFObjectHandle::newName(pagemode));
     }
 }
diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index 66f0dd0..3ac9942 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -1782,12 +1782,11 @@ QPDFWriter::writeObjectStream(QPDFObjectHandle object)
         write(" /Filter /FlateDecode");
     }
     write(" /N ").write(offsets.size()).write_qdf("\n ").write(" /First ").write(first);
-    if (!object.isNull()) {
+    if (!object.null()) {
         // If the original object has an /Extends key, preserve it.
         QPDFObjectHandle dict = object.getDict();
         QPDFObjectHandle extends = dict.getKey("/Extends");
         if (extends.isIndirect()) {
-            QTC::TC("qpdf", "QPDFWriter copy Extends");
             write_qdf("\n ").write(" /Extends ");
             unparseChild(extends, 1, f_in_ostream);
         }
diff --git a/qpdf/qpdf.testcov b/qpdf/qpdf.testcov
index 7296c54..2fee084 100644
--- a/qpdf/qpdf.testcov
+++ b/qpdf/qpdf.testcov
@@ -85,7 +85,6 @@ QPDF ignoring XRefStm in trailer 0
 QPDF xref deleted object 0
 SF_FlateLzwDecode PNG filter 0
 QPDF xref /Index is array 1
-QPDFWriter copy Extends 0
 QPDFWriter encrypt object stream 0
 QPDFWriter uncompressing page dictionary 0
 QPDFWriter uncompressing root 0