diff --git a/libqpdf/qpdf-c.cc b/libqpdf/qpdf-c.cc
index 7feabd1c..01987365 100644
--- a/libqpdf/qpdf-c.cc
+++ b/libqpdf/qpdf-c.cc
@@ -12,6 +12,7 @@
 #include <qpdf/QPDFWriter.hh>
 #include <qpdf/QTC.hh>
 #include <qpdf/QUtil.hh>
+#include <qpdf/qpdf-c_impl.hh>
 #include <qpdf/qpdflogger-c_impl.hh>
 
 #include <cstring>
@@ -20,42 +21,6 @@
 #include <stdexcept>
 #include <string>
 
-struct _qpdf_error
-{
-    std::shared_ptr<QPDFExc> exc;
-};
-
-struct _qpdf_data
-{
-    _qpdf_data() = default;
-    ~_qpdf_data() = default;
-
-    std::shared_ptr<QPDF> qpdf;
-    std::shared_ptr<QPDFWriter> qpdf_writer;
-
-    std::shared_ptr<QPDFExc> error;
-    _qpdf_error tmp_error;
-    std::list<QPDFExc> warnings;
-    std::string tmp_string;
-
-    // Parameters for functions we call
-    char const* filename{nullptr}; // or description
-    char const* buffer{nullptr};
-    unsigned long long size{0};
-    char const* password{nullptr};
-    bool write_memory{false};
-    std::shared_ptr<Buffer> output_buffer;
-
-    // QPDFObjectHandle support
-    bool silence_errors{false};
-    bool oh_error_occurred{false};
-    std::map<qpdf_oh, std::shared_ptr<QPDFObjectHandle>> oh_cache;
-    qpdf_oh next_oh{0};
-    std::set<std::string> cur_iter_dict_keys;
-    std::set<std::string>::const_iterator dict_iter;
-    std::string cur_dict_key;
-};
-
 // must set qpdf->filename and qpdf->password
 static void
 call_read(qpdf_data qpdf)
diff --git a/libqpdf/qpdf/qpdf-c_impl.hh b/libqpdf/qpdf/qpdf-c_impl.hh
new file mode 100644
index 00000000..0d52cf10
--- /dev/null
+++ b/libqpdf/qpdf/qpdf-c_impl.hh
@@ -0,0 +1,47 @@
+#include <qpdf/qpdf-c.h>
+
+#include <memory>
+
+#include <qpdf/QPDF.hh>
+#include <qpdf/QPDFExc.hh>
+#include <qpdf/QPDFWriter.hh>
+
+struct _qpdf_error
+{
+    std::shared_ptr<QPDFExc> exc;
+};
+
+struct _qpdf_data
+{
+    _qpdf_data() = default;
+
+    _qpdf_data(std::unique_ptr<QPDF>&& qpdf) :
+        qpdf(std::move(qpdf)){};
+
+    ~_qpdf_data() = default;
+
+    std::shared_ptr<QPDF> qpdf;
+    std::shared_ptr<QPDFWriter> qpdf_writer;
+
+    std::shared_ptr<QPDFExc> error;
+    _qpdf_error tmp_error;
+    std::list<QPDFExc> warnings;
+    std::string tmp_string;
+
+    // Parameters for functions we call
+    char const* filename{nullptr}; // or description
+    char const* buffer{nullptr};
+    unsigned long long size{0};
+    char const* password{nullptr};
+    bool write_memory{false};
+    std::shared_ptr<Buffer> output_buffer;
+
+    // QPDFObjectHandle support
+    bool silence_errors{false};
+    bool oh_error_occurred{false};
+    std::map<qpdf_oh, std::shared_ptr<QPDFObjectHandle>> oh_cache;
+    qpdf_oh next_oh{0};
+    std::set<std::string> cur_iter_dict_keys;
+    std::set<std::string>::const_iterator dict_iter;
+    std::string cur_dict_key;
+};