diff --git a/src/libs/utils/mimetypes2/mimeglobpattern.cpp b/src/libs/utils/mimetypes2/mimeglobpattern.cpp
index 9b9c78af456..5921f2718d3 100644
--- a/src/libs/utils/mimetypes2/mimeglobpattern.cpp
+++ b/src/libs/utils/mimetypes2/mimeglobpattern.cpp
@@ -34,9 +34,9 @@ void MimeGlobMatchResult::addMatch(const QString &mimeType, int weight, const QS
     bool replace = weight > m_weight;
     if (!replace) {
         // Compare the length of the match
-        if (pattern.length() < m_matchingPatternLength)
+        if (pattern.size() < m_matchingPatternLength)
             return; // too short, ignore
-        else if (pattern.length() > m_matchingPatternLength) {
+        else if (pattern.size() > m_matchingPatternLength) {
             // longer: clear any previous match (like *.bz2, when pattern is *.tar.bz2)
             replace = true;
         }
@@ -44,7 +44,7 @@ void MimeGlobMatchResult::addMatch(const QString &mimeType, int weight, const QS
     if (replace) {
         m_matchingMimeTypes.clear();
         // remember the new "longer" length
-        m_matchingPatternLength = pattern.length();
+        m_matchingPatternLength = pattern.size();
         m_weight = weight;
     }
     if (!m_matchingMimeTypes.contains(mimeType)) {
@@ -59,7 +59,7 @@ void MimeGlobMatchResult::addMatch(const QString &mimeType, int weight, const QS
 
 MimeGlobPattern::PatternType MimeGlobPattern::detectPatternType(const QString &pattern) const
 {
-    const int patternLength = pattern.length();
+    const int patternLength = pattern.size();
     if (!patternLength)
         return OtherPattern;
 
@@ -108,10 +108,10 @@ bool MimeGlobPattern::matchFileName(const QString &inputFileName) const
     const QString fileName = m_caseSensitivity == Qt::CaseInsensitive
             ? inputFileName.toLower() : inputFileName;
 
-    const int patternLength = m_pattern.length();
+    const int patternLength = m_pattern.size();
     if (!patternLength)
         return false;
-    const int fileNameLength = fileName.length();
+    const int fileNameLength = fileName.size();
 
     switch (m_patternType) {
     case SuffixPattern: {
@@ -167,7 +167,7 @@ static bool isSimplePattern(const QString &pattern)
 {
    // starts with "*.", has no other '*'
    return pattern.lastIndexOf(u'*') == 0
-      && pattern.length() > 1
+      && pattern.size() > 1
       && pattern.at(1) == u'.' // (other dots are OK, like *.tar.bz2)
       // and contains no other special character
       && !pattern.contains(u'?')
@@ -233,7 +233,7 @@ void MimeGlobPatternList::match(MimeGlobMatchResult &result,
             continue;
         if (glob.matchFileName(fileName)) {
             const QString pattern = glob.pattern();
-            const int suffixLen = isSimplePattern(pattern) ? pattern.length() - 2 : 0;
+            const int suffixLen = isSimplePattern(pattern) ? pattern.size() - 2 : 0;
             result.addMatch(glob.mimeType(), glob.weight(), pattern, suffixLen);
         }
     }
diff --git a/src/libs/utils/mimetypes2/mimeprovider.cpp b/src/libs/utils/mimetypes2/mimeprovider.cpp
index fdd40d4c512..0ed178348be 100644
--- a/src/libs/utils/mimetypes2/mimeprovider.cpp
+++ b/src/libs/utils/mimetypes2/mimeprovider.cpp
@@ -225,7 +225,7 @@ void MimeBinaryProvider::addFileNameMatches(const QString &fileName, MimeGlobMat
                         numRoots,
                         firstRootOffset,
                         lowerFileName,
-                        lowerFileName.length() - 1,
+                        lowerFileName.size() - 1,
                         false);
         if (result.m_matchingMimeTypes.isEmpty())
             matchSuffixTree(result,
@@ -233,7 +233,7 @@ void MimeBinaryProvider::addFileNameMatches(const QString &fileName, MimeGlobMat
                             numRoots,
                             firstRootOffset,
                             fileName,
-                            fileName.length() - 1,
+                            fileName.size() - 1,
                             true);
     }
     // Check complex globs (e.g. "callgrind.out[0-9]*" or "README*")
@@ -482,7 +482,7 @@ void MimeBinaryProvider::addAllMimeTypes(QList<MimeType> &result)
 {
     loadMimeTypeList();
     if (result.isEmpty()) {
-        result.reserve(m_mimetypeNames.count());
+        result.reserve(m_mimetypeNames.size());
         for (const QString &name : std::as_const(m_mimetypeNames))
             result.append(mimeTypeForNameUnchecked(name));
     } else {
diff --git a/src/libs/utils/mimetypes2/mimetype.cpp b/src/libs/utils/mimetypes2/mimetype.cpp
index b0914b57d7a..2ecce70969a 100644
--- a/src/libs/utils/mimetypes2/mimetype.cpp
+++ b/src/libs/utils/mimetypes2/mimetype.cpp
@@ -24,7 +24,7 @@ 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("*."_L1) &&
-        pattern.length() > 2 &&
+        pattern.size() > 2 &&
         pattern.indexOf(u'*', 2) < 0 && pattern.indexOf(u'?', 2) < 0) {
         return pattern.mid(2);
     }