diff --git a/src/libs/utils/fileutils.cpp b/src/libs/utils/fileutils.cpp
index 2cecc2810b9..0c6a321c714 100644
--- a/src/libs/utils/fileutils.cpp
+++ b/src/libs/utils/fileutils.cpp
@@ -133,7 +133,7 @@ bool FileSaverBase::write(const QByteArray &bytes)
 {
     if (m_hasError)
         return false;
-    return setResult(m_file->write(bytes) == bytes.count());
+    return setResult(m_file->write(bytes) == bytes.size());
 }
 
 bool FileSaverBase::setResult(bool ok)
diff --git a/src/libs/utils/macroexpander.cpp b/src/libs/utils/macroexpander.cpp
index 4dc18b23f6b..3ab7d92e9a6 100644
--- a/src/libs/utils/macroexpander.cpp
+++ b/src/libs/utils/macroexpander.cpp
@@ -77,7 +77,7 @@ public:
                 MacroExpander::PrefixFunction pf = it.value();
                 if (found)
                     *found = true;
-                return pf(QString::fromUtf8(variable.mid(it.key().count())));
+                return pf(QString::fromUtf8(variable.mid(it.key().size())));
             }
         }
         if (found)
diff --git a/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp b/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
index e8ff40b3105..baa884d9f23 100644
--- a/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
@@ -272,10 +272,10 @@ CMakeConfigItem CMakeConfigItem::fromString(const QString &s)
 
 static QByteArray trimCMakeCacheLine(const QByteArray &in) {
     int start = 0;
-    while (start < in.count() && (in.at(start) == ' ' || in.at(start) == '\t'))
+    while (start < in.size() && (in.at(start) == ' ' || in.at(start) == '\t'))
         ++start;
 
-    return in.mid(start, in.count() - start - 1);
+    return in.mid(start, in.size() - start - 1);
 }
 
 static QByteArrayList splitCMakeCacheLine(const QByteArray &line) {
@@ -377,9 +377,9 @@ CMakeConfig CMakeConfig::fromFile(const Utils::FilePath &cacheFile, QString *err
         const QByteArray value = pieces.at(2);
 
         if (key.endsWith("-ADVANCED") && value == "1") {
-            advancedSet.insert(key.left(key.count() - 9 /* "-ADVANCED" */));
+            advancedSet.insert(key.left(key.size() - 9 /* "-ADVANCED" */));
         } else if (key.endsWith("-STRINGS") && CMakeConfigItem::typeStringToType(type) == CMakeConfigItem::INTERNAL) {
-            valuesMap[key.left(key.count() - 8) /* "-STRINGS" */] = value;
+            valuesMap[key.left(key.size() - 8) /* "-STRINGS" */] = value;
         } else {
             CMakeConfigItem::Type t = CMakeConfigItem::typeStringToType(type);
             result << CMakeConfigItem(key, t, documentation, value);
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp b/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp
index 3a7a7e6c534..4fef3bda467 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp
@@ -431,7 +431,7 @@ static QVector<ToolChainDescription> extractToolChainsFromCache(const CMakeConfi
     for (const CMakeConfigItem &i : config) {
         if (!i.key.startsWith("CMAKE_") || !i.key.endsWith("_COMPILER"))
             continue;
-        const QByteArray language = i.key.mid(6, i.key.count() - 6 - 9); // skip "CMAKE_" and "_COMPILER"
+        const QByteArray language = i.key.mid(6, i.key.size() - 6 - 9); // skip "CMAKE_" and "_COMPILER"
         Id languageId;
         if (language == "CXX") {
             haveCCxxCompiler = true;
diff --git a/src/plugins/debugger/uvsc/uvscutils.cpp b/src/plugins/debugger/uvsc/uvscutils.cpp
index c08e28e4fda..b7fecfb2487 100644
--- a/src/plugins/debugger/uvsc/uvscutils.cpp
+++ b/src/plugins/debugger/uvsc/uvscutils.cpp
@@ -73,8 +73,8 @@ QByteArray encodeBreakPoint(BKTYPE type, const QString &exp, const QString &cmd)
     bkPtr->type = type;
     bkPtr->count = 1;
     bkPtr->accessSize = 0;
-    bkPtr->expressionLength = asciiExp.count() + 1;
-    bkPtr->commandLength = asciiCmd.count() + 1;
+    bkPtr->expressionLength = asciiExp.size() + 1;
+    bkPtr->commandLength = asciiCmd.size() + 1;
     return buffer;
 }
 
@@ -185,7 +185,7 @@ QString adjustHexValue(QString hex, const QString &type)
         return QString::number(v);
     } else {
         const bool isUnsigned = type.startsWith("unsigned");
-        switch (data.count()) {
+        switch (data.size()) {
         case 1:
             if (isUnsigned) {
                 quint8 v = 0;
diff --git a/src/plugins/qtsupport/baseqtversion.cpp b/src/plugins/qtsupport/baseqtversion.cpp
index 179649c53b8..4720718a860 100644
--- a/src/plugins/qtsupport/baseqtversion.cpp
+++ b/src/plugins/qtsupport/baseqtversion.cpp
@@ -2101,8 +2101,7 @@ static QByteArray scanQtBinaryForBuildString(const FilePath &library)
 
 static QStringList extractFieldsFromBuildString(const QByteArray &buildString)
 {
-    if (buildString.isEmpty()
-            || buildString.count() > 4096)
+    if (buildString.isEmpty() || buildString.size() > 4096)
         return QStringList();
 
     const QRegularExpression buildStringMatcher("^Qt "
diff --git a/src/tools/qml2puppet/qml2puppet/instances/objectnodeinstance.cpp b/src/tools/qml2puppet/qml2puppet/instances/objectnodeinstance.cpp
index 88689d4c304..26999ef2a2f 100644
--- a/src/tools/qml2puppet/qml2puppet/instances/objectnodeinstance.cpp
+++ b/src/tools/qml2puppet/qml2puppet/instances/objectnodeinstance.cpp
@@ -581,7 +581,7 @@ void ObjectNodeInstance::refreshProperty(const PropertyName &name)
 
     if (oldValue.type() == QVariant::Url) {
         QByteArray key = oldValue.toUrl().toEncoded(QUrl::UrlFormattingOption(0x100));
-        QString pixmapKey = QString::fromUtf8(key.constData(), key.count());
+        QString pixmapKey = QString::fromUtf8(key.constData(), key.size());
         QPixmapCache::remove(pixmapKey);
     }
 
diff --git a/src/tools/sdktool/sdkpersistentsettings.cpp b/src/tools/sdktool/sdkpersistentsettings.cpp
index 4ca9b5e3701..34b139e2324 100644
--- a/src/tools/sdktool/sdkpersistentsettings.cpp
+++ b/src/tools/sdktool/sdkpersistentsettings.cpp
@@ -316,7 +316,7 @@ bool SdkFileSaverBase::write(const QByteArray &bytes)
 {
     if (m_hasError)
         return false;
-    return setResult(m_file->write(bytes) == bytes.count());
+    return setResult(m_file->write(bytes) == bytes.size());
 }
 
 bool SdkFileSaverBase::setResult(bool ok)