diff --git a/src/libs/utils/mimetypes2/mimetype.cpp b/src/libs/utils/mimetypes2/mimetype.cpp
index b5c59394474..ca1964ed9eb 100644
--- a/src/libs/utils/mimetypes2/mimetype.cpp
+++ b/src/libs/utils/mimetypes2/mimetype.cpp
@@ -54,6 +54,17 @@
 
 namespace Utils {
 
+static QString suffixFromPattern(const QString &pattern)
+{
+    // Not a simple suffix if it looks like: README or *. or *.* or *.JP*G or *.JP?
+    if (pattern.startsWith(QLatin1String("*.")) &&
+        pattern.length() > 2 &&
+        pattern.indexOf(QLatin1Char('*'), 2) < 0 && pattern.indexOf(QLatin1Char('?'), 2) < 0) {
+        return pattern.mid(2);
+    }
+    return {};
+}
+
 MimeTypePrivate::MimeTypePrivate()
     : loaded(false), fromCache(false)
 {}
@@ -445,13 +456,9 @@ QStringList MimeType::suffixes() const
 
     QStringList result;
     for (const QString &pattern : qAsConst(d->globPatterns)) {
-        // Not a simple suffix if it looks like: README or *. or *.* or *.JP*G or *.JP?
-        if (pattern.startsWith(QLatin1String("*.")) &&
-            pattern.length() > 2 &&
-            pattern.indexOf(QLatin1Char('*'), 2) < 0 && pattern.indexOf(QLatin1Char('?'), 2) < 0) {
-            const QString suffix = pattern.mid(2);
+        const QString suffix = suffixFromPattern(pattern);
+        if (!suffix.isEmpty())
             result.append(suffix);
-        }
     }
 
     return result;
@@ -533,15 +540,16 @@ bool MimeType::matchesName(const QString &nameOrAlias) const
 */
 void MimeType::setPreferredSuffix(const QString &suffix)
 {
-//    MimeDatabasePrivate::instance()->provider()->loadMimeTypePrivate(*d);
+    MimeDatabasePrivate::instance()->loadMimeTypePrivate(const_cast<MimeTypePrivate&>(*d));
 
-//    auto it = std::find_if(d->globPatterns.begin(), d->globPatterns.end(),
-//                           [suffix](const QString &pattern) {
-//                               return suffixFromPattern(pattern) == suffix;
-//                           });
-//    if (it != d->globPatterns.end())
-//        d->globPatterns.erase(it);
-//    d->globPatterns.prepend(QLatin1String("*.") + suffix);
+    auto it = std::find_if(d->globPatterns.begin(),
+                           d->globPatterns.end(),
+                           [suffix](const QString &pattern) {
+                               return suffixFromPattern(pattern) == suffix;
+                           });
+    if (it != d->globPatterns.end())
+        d->globPatterns.erase(it);
+    d->globPatterns.prepend(QLatin1String("*.") + suffix);
 }
 
 } // namespace Utils