diff --git a/src/qml/compiler/qqmlcodegenerator.cpp b/src/qml/compiler/qqmlcodegenerator.cpp
index 5d3123569f..f3b92fd27f 100644
--- a/src/qml/compiler/qqmlcodegenerator.cpp
+++ b/src/qml/compiler/qqmlcodegenerator.cpp
@@ -946,7 +946,7 @@ void QQmlCodeGenerator::appendBinding(AST::UiQualifiedId *name, int objectIndex,
 void QQmlCodeGenerator::appendBinding(const AST::SourceLocation &nameLocation, quint32 propertyNameIndex, AST::Statement *value)
 {
     if (stringAt(propertyNameIndex) == QStringLiteral("id")) {
-        setId(value);
+        setId(nameLocation, value);
         return;
     }
 
@@ -1009,7 +1009,7 @@ QmlObject *QQmlCodeGenerator::bindingsTarget() const
     return _object;
 }
 
-bool QQmlCodeGenerator::setId(AST::Statement *value)
+bool QQmlCodeGenerator::setId(const AST::SourceLocation &idLocation, AST::Statement *value)
 {
     AST::SourceLocation loc = value->firstSourceLocation();
     QStringRef str;
@@ -1047,6 +1047,9 @@ bool QQmlCodeGenerator::setId(AST::Statement *value)
     if (illegalNames.contains(idQString))
         COMPILE_EXCEPTION(loc, tr( "ID illegally masks global JavaScript property"));
 
+    if (_object->idIndex != emptyStringIndex)
+        COMPILE_EXCEPTION(idLocation, tr("Property value set multiple times"));
+
     _object->idIndex = registerString(idQString);
     _object->locationOfIdProperty.line = loc.startLine;
     _object->locationOfIdProperty.column = loc.startColumn;
diff --git a/src/qml/compiler/qqmlcodegenerator_p.h b/src/qml/compiler/qqmlcodegenerator_p.h
index eae359418a..124b46bc9e 100644
--- a/src/qml/compiler/qqmlcodegenerator_p.h
+++ b/src/qml/compiler/qqmlcodegenerator_p.h
@@ -162,7 +162,7 @@ struct QmlObject
     Q_DECLARE_TR_FUNCTIONS(QmlObject)
 public:
     int inheritedTypeNameIndex;
-    int idIndex;
+    quint32 idIndex;
     int indexOfDefaultProperty;
 
     QV4::CompiledData::Location location;
@@ -293,7 +293,7 @@ public:
 
     QmlObject *bindingsTarget() const;
 
-    bool setId(AST::Statement *value);
+    bool setId(const AST::SourceLocation &idLocation, AST::Statement *value);
 
     // resolves qualified name (font.pixelSize for example) and returns the last name along
     // with the object any right-hand-side of a binding should apply to.