diff --git a/src/plugins/qmldesigner/libs/designercore/designercoreutils/uniquename.cpp b/src/plugins/qmldesigner/libs/designercore/designercoreutils/uniquename.cpp
index 1f45259b891..dbef5d45953 100644
--- a/src/plugins/qmldesigner/libs/designercore/designercoreutils/uniquename.cpp
+++ b/src/plugins/qmldesigner/libs/designercore/designercoreutils/uniquename.cpp
@@ -59,19 +59,27 @@ void capitalizeFirstLetter(QString &str)
         str.front() = str.front().toUpper();
 }
 
-void prependUnderscoreIfBanned(QString &id)
+void prependUnderscoreIfDigit(QString &id)
 {
-    if (id.size() && (id.front().isDigit() || ModelUtils::isBannedQmlId(id)))
+    if (id.size() && id.front().isDigit())
         id.prepend(u'_');
 }
 
+void appendDigitIfBannedQmlId(QString &id)
+{
+    if (ModelUtils::isBannedQmlId(id))
+        id.append(u'1');
+}
+
 QString toValidId(QStringView id)
 {
     QString validId = filterInvalidLettersAndCapitalizeAfterInvalidLetter(id);
 
     lowerFirstLetter(validId);
 
-    prependUnderscoreIfBanned(validId);
+    prependUnderscoreIfDigit(validId);
+
+    appendDigitIfBannedQmlId(validId);
 
     return validId;
 }
diff --git a/tests/unit/tests/unittests/designercoreutils/uniquename-test.cpp b/tests/unit/tests/unittests/designercoreutils/uniquename-test.cpp
index 51c9969a894..69b14b3ea9f 100644
--- a/tests/unit/tests/unittests/designercoreutils/uniquename-test.cpp
+++ b/tests/unit/tests/unittests/designercoreutils/uniquename-test.cpp
@@ -61,14 +61,25 @@ TEST(UniqueName, generateId_properly_handles_dot_separated_words)
     ASSERT_THAT(uniqueId, "fooBarFoo");
 }
 
-TEST(UniqueName, generateId_prefixes_with_underscore_if_id_is_a_reserved_word)
+TEST(UniqueName, generateId_appends_digit_if_id_is_a_reserved_word)
 {
     auto pred = [&](const QString &) -> bool { return false; };
     QString id = "for";
 
     QString uniqueId = UniqueName::generateId(id, pred);
 
-    ASSERT_THAT(uniqueId, "_for");
+    ASSERT_THAT(uniqueId, "for1");
+}
+
+TEST(UniqueName, generateId_generates_unique_id_if_id_is_a_reserved_word)
+{
+    QStringList reservedIds{"for1", "for2"};
+    auto pred = [&](const QString &newId) -> bool { return reservedIds.contains(newId); };
+    QString id = "for";
+
+    QString uniqueId = UniqueName::generateId(id, pred);
+
+    ASSERT_THAT(uniqueId, "for3");
 }
 
 TEST(UniqueName, generateId_prefixes_with_underscore_if_id_is_a_number)