1 files changed, 7 insertions, 7 deletions

diff --git a/src/mbgl/style/layers/background_layer.cpp b/src/mbgl/style/layers/background_layer.cpp
index 89b367b632..8d2b1b144b 100644
--- a/src/mbgl/style/layers/background_layer.cpp
+++ b/src/mbgl/style/layers/background_layer.cpp
@@ -66,11 +66,11 @@ PropertyValue<Color> BackgroundLayer::getDefaultBackgroundColor() {
     return { Color::black() };
 }
 
-PropertyValue<Color> BackgroundLayer::getBackgroundColor() const {
+const PropertyValue<Color>& BackgroundLayer::getBackgroundColor() const {
     return impl().paint.template get<BackgroundColor>().value;
 }
 
-void BackgroundLayer::setBackgroundColor(PropertyValue<Color> value) {
+void BackgroundLayer::setBackgroundColor(const PropertyValue<Color>& value) {
     if (value == getBackgroundColor())
         return;
     auto impl_ = mutableImpl();
@@ -93,11 +93,11 @@ PropertyValue<std::string> BackgroundLayer::getDefaultBackgroundPattern() {
     return { "" };
 }
 
-PropertyValue<std::string> BackgroundLayer::getBackgroundPattern() const {
+const PropertyValue<std::string>& BackgroundLayer::getBackgroundPattern() const {
     return impl().paint.template get<BackgroundPattern>().value;
 }
 
-void BackgroundLayer::setBackgroundPattern(PropertyValue<std::string> value) {
+void BackgroundLayer::setBackgroundPattern(const PropertyValue<std::string>& value) {
     if (value == getBackgroundPattern())
         return;
     auto impl_ = mutableImpl();
@@ -120,11 +120,11 @@ PropertyValue<float> BackgroundLayer::getDefaultBackgroundOpacity() {
     return { 1 };
 }
 
-PropertyValue<float> BackgroundLayer::getBackgroundOpacity() const {
+const PropertyValue<float>& BackgroundLayer::getBackgroundOpacity() const {
     return impl().paint.template get<BackgroundOpacity>().value;
 }
 
-void BackgroundLayer::setBackgroundOpacity(PropertyValue<float> value) {
+void BackgroundLayer::setBackgroundOpacity(const PropertyValue<float>& value) {
     if (value == getBackgroundOpacity())
         return;
     auto impl_ = mutableImpl();
@@ -169,7 +169,7 @@ optional<Error> BackgroundLayer::setPaintProperty(const std::string& name, const
         return Error { "layer doesn't support this property" };
     }
 
-    Property property = static_cast<Property>(it->second);
+    auto property = static_cast<Property>(it->second);
 
         
     if (property == Property::BackgroundColor) {