diff --git a/wallpapers/image/backgroundlistmodel.h b/wallpapers/image/backgroundlistmodel.h
--- a/wallpapers/image/backgroundlistmodel.h
+++ b/wallpapers/image/backgroundlistmodel.h
@@ -131,6 +131,7 @@
     QString token() const;
 
     static const QStringList &suffixes();
+    static bool isAcceptableSuffix(const QString &suffix);
 
 Q_SIGNALS:
     void backgroundsFound(const QStringList &paths, const QString &token);
diff --git a/wallpapers/image/backgroundlistmodel.cpp b/wallpapers/image/backgroundlistmodel.cpp
--- a/wallpapers/image/backgroundlistmodel.cpp
+++ b/wallpapers/image/backgroundlistmodel.cpp
@@ -522,6 +522,14 @@
     return m_suffixes;
 }
 
+bool BackgroundFinder::isAcceptableSuffix(const QString &suffix)
+{
+    // Despite its name, suffixes() returns a list of glob patterns.
+    // Therefore the file suffix check needs to include the "*." prefix.
+    const QStringList &globPatterns = suffixes();
+    return globPatterns.contains("*."+suffix.toLower());
+}
+
 void BackgroundFinder::run()
 {
     QTime t;
diff --git a/wallpapers/image/image.cpp b/wallpapers/image/image.cpp
--- a/wallpapers/image/image.cpp
+++ b/wallpapers/image/image.cpp
@@ -769,7 +769,7 @@
 {
     if(!m_slideshowBackgrounds.contains(path)) {
         QFileInfo fileInfo(path);
-        if(fileInfo.isFile() && BackgroundFinder::suffixes().contains(fileInfo.suffix().toLower())) {
+        if(fileInfo.isFile() && BackgroundFinder::isAcceptableSuffix(fileInfo.suffix())) {
             m_slideshowBackgrounds.append(path);
             m_unseenSlideshowBackgrounds.append(path);
             if(m_slideshowBackgrounds.count() == 1) {