diff --git a/share/qtcreator/templates/wizards/classes/cpp/wizard.json b/share/qtcreator/templates/wizards/classes/cpp/wizard.json
index ad2a8f77845..9b8cfc3dc8e 100644
--- a/share/qtcreator/templates/wizards/classes/cpp/wizard.json
+++ b/share/qtcreator/templates/wizards/classes/cpp/wizard.json
@@ -19,7 +19,7 @@
         { "key": "isQObject", "value": "%{JS: [ 'QObject', 'QWidget', 'QMainWindow', 'QQuickItem'].indexOf(value('Base')) >= 0 }" },
         { "key": "GUARD", "value": "%{JS: Cpp.headerGuard(value('HdrFileName'))}" },
         { "key": "SharedDataInit", "value": "%{JS: (value('IncludeQSharedData')) ? 'data(new %{CN}Data)' : '' }" },
-        { "key": "Dependencies", "value": "%{JS: '' + (value('IncludeQObject') || value('IncludeQSharedData') || value('BaseCB') === 'QObject' ? ':Qt.core' : '') + (value('IncludeQWidget') || value('IncludeQMainWindow') || value('BaseCB') === 'QWidget' || value('BaseCB') === 'QMainWindow' ? ':Qt.widgets' : '') + (value('IncludeQQuickItem') || value('BaseCB') === 'QQuickItem' ? ':Qt.quick' : '')}"}
+        { "key": "Dependencies", "value": "%{JS: '' + (value('IncludeQObject') || value('IncludeQSharedData') || value('BaseCB') === 'QObject' ? ':Qt.Core' : '') + (value('IncludeQWidget') || value('IncludeQMainWindow') || value('BaseCB') === 'QWidget' || value('BaseCB') === 'QMainWindow' ? ':Qt.Widgets' : '') + (value('IncludeQQuickItem') || value('BaseCB') === 'QQuickItem' ? ':Qt.Quick' : '')}"}
     ],
 
     "pages":
diff --git a/src/plugins/qbsprojectmanager/qbsproject.cpp b/src/plugins/qbsprojectmanager/qbsproject.cpp
index a8ad354181c..ac554b9d2bb 100644
--- a/src/plugins/qbsprojectmanager/qbsproject.cpp
+++ b/src/plugins/qbsprojectmanager/qbsproject.cpp
@@ -309,17 +309,22 @@ bool QbsBuildSystem::renameFiles(Node *context, const FilePairs &filesToRename,
 
 bool QbsBuildSystem::addDependencies(ProjectExplorer::Node *context, const QStringList &dependencies)
 {
+    const QStringList lowercaseDeps = transform(dependencies, [](const QString &dep) -> QString {
+        QTC_ASSERT(dep.size() > 3, return dep);
+        return dep.left(3) + dep.mid(3).toLower();
+    });
+
     if (session()->apiLevel() < 9)
-        return BuildSystem::addDependencies(context, dependencies);
+        return BuildSystem::addDependencies(context, lowercaseDeps);
 
     if (auto *n = dynamic_cast<QbsGroupNode *>(context)) {
         const QbsProductNode * const prdNode = parentQbsProductNode(n);
         QTC_ASSERT(prdNode, return false);
-        return addDependenciesToProduct(dependencies, prdNode->productData(), n->groupData());
+        return addDependenciesToProduct(lowercaseDeps, prdNode->productData(), n->groupData());
     }
 
     if (auto *n = dynamic_cast<QbsProductNode *>(context))
-        return addDependenciesToProduct(dependencies, n->productData(), n->mainGroup());
+        return addDependenciesToProduct(lowercaseDeps, n->productData(), n->mainGroup());
 
     return BuildSystem::addDependencies(context, dependencies);
 }
diff --git a/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp b/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp
index e8d3d88668b..42044e4caa9 100644
--- a/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp
+++ b/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp
@@ -628,7 +628,7 @@ bool QmakePriFile::addDependencies(const QStringList &dependencies)
         return dep.length() > 3 && dep.startsWith("Qt.");
     });
     qtDependencies = transform(qtDependencies, [](const QString &dep) {
-        return dep.mid(3);
+        return dep.mid(3).toLower();
     });
     if (qtDependencies.isEmpty())
         return true;
diff --git a/src/plugins/qtsupport/baseqtversion.cpp b/src/plugins/qtsupport/baseqtversion.cpp
index 6d4c6aca7cf..220699343ee 100644
--- a/src/plugins/qtsupport/baseqtversion.cpp
+++ b/src/plugins/qtsupport/baseqtversion.cpp
@@ -310,7 +310,7 @@ QString QtVersion::moduleForHeader(const QString &headerFileName) const
     for (auto it = d->m_classesPerModule->cbegin(); it != d->m_classesPerModule->cend(); ++it) {
         if (it.value().contains(headerFileName)) {
             QTC_ASSERT(it.key().size() > 2, return it.key());
-            return it.key().left(2) + '.' + it.key().mid(2).toLower();
+            return it.key().left(2) + '.' + it.key().mid(2);
         }
     }
     return {};
diff --git a/src/plugins/qtsupport/baseqtversion.h b/src/plugins/qtsupport/baseqtversion.h
index 2d404aba070..0894161adb8 100644
--- a/src/plugins/qtsupport/baseqtversion.h
+++ b/src/plugins/qtsupport/baseqtversion.h
@@ -174,7 +174,7 @@ public:
     Utils::FilePath librarySearchPath() const;
 
     Utils::FilePaths directoriesToIgnoreInProjectTree() const;
-    QString moduleForHeader(const QString &className) const; // Format is "Qt.core"
+    QString moduleForHeader(const QString &className) const; // Format is "Qt.Core"
 
     QString qtNamespace() const;
     QString qtLibInfix() const;