diff --git a/src/gui/painting/qpagedpaintdevice.h b/src/gui/painting/qpagedpaintdevice.h
index 1c37c17fa3..21e23e0eb4 100644
--- a/src/gui/painting/qpagedpaintdevice.h
+++ b/src/gui/painting/qpagedpaintdevice.h
@@ -213,6 +213,7 @@ public:
         Envelope10 = Comm10E
     };
 
+    // keep in sync with QPdfEngine::PdfVersion!
     enum PdfVersion { PdfVersion_1_4, PdfVersion_A1b, PdfVersion_1_6 };
 
     // ### Qt6 Make these virtual
diff --git a/src/gui/painting/qpdf_p.h b/src/gui/painting/qpdf_p.h
index e337c61f64..e5649eb9dc 100644
--- a/src/gui/painting/qpdf_p.h
+++ b/src/gui/painting/qpdf_p.h
@@ -168,6 +168,7 @@ class Q_GUI_EXPORT QPdfEngine : public QPaintEngine
     Q_DECLARE_PRIVATE(QPdfEngine)
     friend class QPdfWriter;
 public:
+    // keep in sync with QPagedPaintDevice::PdfVersion!
     enum PdfVersion
     {
         Version_1_4,
diff --git a/src/gui/painting/qpdfwriter.cpp b/src/gui/painting/qpdfwriter.cpp
index 7f18ce42be..bf7e2d3dca 100644
--- a/src/gui/painting/qpdfwriter.cpp
+++ b/src/gui/painting/qpdfwriter.cpp
@@ -170,17 +170,11 @@ void QPdfWriter::setPdfVersion(PdfVersion version)
 {
     Q_D(QPdfWriter);
 
-    static const QHash<QPdfWriter::PdfVersion, QPdfEngine::PdfVersion> engineMapping {
-        {QPdfWriter::PdfVersion_1_4, QPdfEngine::Version_1_4},
-        {QPdfWriter::PdfVersion_A1b, QPdfEngine::Version_A1b},
-        {QPdfWriter::PdfVersion_1_6, QPdfEngine::Version_1_6}
-    };
-
     if (d->pdfVersion == version)
         return;
 
     d->pdfVersion = version;
-    d->engine->setPdfVersion(engineMapping.value(version, QPdfEngine::Version_1_4));
+    d->engine->setPdfVersion(static_cast<QPdfEngine::PdfVersion>(static_cast<int>(version)));
 }
 
 /*!