--- a/sources/pdfmodel.cpp
+++ b/sources/pdfmodel.cpp
@@ -658,6 +658,10 @@ QList< QRectF > PdfPage::search(const QString& text, bool matchCase, bool wholeW
 
 #endif // HAS_POPPLER_31 HAS_POPPLER_22 HAS_POPPLER_14
 
+#ifndef HAS_POPPLER_31
+    Q_UNUSED(wholeWords);
+#endif
+
     return results;
 }