diff --git a/libqpdf/QPDFNumberTreeObjectHelper.cc b/libqpdf/QPDFNumberTreeObjectHelper.cc
index bf360cf5..40b1c6f9 100644
--- a/libqpdf/QPDFNumberTreeObjectHelper.cc
+++ b/libqpdf/QPDFNumberTreeObjectHelper.cc
@@ -1,5 +1,4 @@
 #include <qpdf/QPDFNumberTreeObjectHelper.hh>
-#include <qpdf/QTC.hh>
 
 QPDFNumberTreeObjectHelper::Members::~Members()
 {
diff --git a/libqpdf/QPDFPageLabelDocumentHelper.cc b/libqpdf/QPDFPageLabelDocumentHelper.cc
index 63be5809..a650fa9c 100644
--- a/libqpdf/QPDFPageLabelDocumentHelper.cc
+++ b/libqpdf/QPDFPageLabelDocumentHelper.cc
@@ -85,8 +85,8 @@ QPDFPageLabelDocumentHelper::getLabelsForPageRange(
     bool skip_first = false;
     if (size >= 2)
     {
-        QPDFObjectHandle last = new_labels[size - 1];
-        QPDFObjectHandle last_idx = new_labels[size - 2];
+        QPDFObjectHandle last = new_labels.at(size - 1);
+        QPDFObjectHandle last_idx = new_labels.at(size - 2);
         if (last_idx.isInteger() && last.isDictionary() &&
             (label.getKey("/S").unparse() == last.getKey("/S").unparse()) &&
             (label.getKey("/P").unparse() == last.getKey("/P").unparse()) &&