diff --git a/src/akonadi/akonadiserializer.cpp b/src/akonadi/akonadiserializer.cpp
--- a/src/akonadi/akonadiserializer.cpp
+++ b/src/akonadi/akonadiserializer.cpp
@@ -89,7 +89,7 @@
     if (naming == FullPath) {
         auto parent = collection.parentCollection();
         while (parent.isValid() && parent != Akonadi::Collection::root()) {
-            name = parent.displayName() + "/" + name;
+            name = parent.displayName() + '/' + name;
             parent = parent.parentCollection();
         }
     }
diff --git a/tests/units/akonadi/akonadiserializertest.cpp b/tests/units/akonadi/akonadiserializertest.cpp
--- a/tests/units/akonadi/akonadiserializertest.cpp
+++ b/tests/units/akonadi/akonadiserializertest.cpp
@@ -317,9 +317,9 @@
         auto dataSource4 = serializer.createDataSourceFromCollection(collection, Akonadi::SerializerInterface::BaseName);
 
         // THEN
-        QCOMPARE(dataSource1->name(), QString(parentName + "/" + name));
+        QCOMPARE(dataSource1->name(), QString(parentName + '/' + name));
         QCOMPARE(dataSource2->name(), name);
-        QCOMPARE(dataSource3->name(), QString(parentName + "/" + name));
+        QCOMPARE(dataSource3->name(), QString(parentName + '/' + name));
         QCOMPARE(dataSource4->name(), name);
     }
 
diff --git a/tests/units/widgets/editorviewtest.cpp b/tests/units/widgets/editorviewtest.cpp
--- a/tests/units/widgets/editorviewtest.cpp
+++ b/tests/units/widgets/editorviewtest.cpp
@@ -327,7 +327,7 @@
 
         // THEN
         QCOMPARE(textEdit->toPlainText(), QString(model.property("title").toString()
-                                                + "\n"
+                                                + '\n'
                                                 + model.property("text").toString()));
         QCOMPARE(startDateEdit->date(), model.property("startDate").toDateTime().date());
         QCOMPARE(dueDateEdit->date(), model.property("dueDate").toDateTime().date());
@@ -402,7 +402,7 @@
 
         // THEN
         QCOMPARE(textEdit->toPlainText(), QString(model.property("title").toString()
-                                                + "\n"
+                                                + '\n'
                                                 + model.property("text").toString()));
     }
 
@@ -426,7 +426,7 @@
 
         // THEN
         QCOMPARE(textEdit->toPlainText(), QString(model.property("title").toString()
-                                                + "\n"
+                                                + '\n'
                                                 + model.property("text").toString()));
     }