diff --git a/platform/ios/MGLPolygon.m b/platform/ios/MGLPolygon.m
index d3b5f2c2a..770a2a4b9 100644
--- a/platform/ios/MGLPolygon.m
+++ b/platform/ios/MGLPolygon.m
@@ -4,7 +4,7 @@
 
 @implementation MGLPolygon
 
-@synthesize overlayBounds;
+@dynamic overlayBounds;
 
 + (instancetype)polygonWithCoordinates:(CLLocationCoordinate2D *)coords
                                  count:(NSUInteger)count
diff --git a/platform/ios/MGLPolyline.m b/platform/ios/MGLPolyline.m
index 86d113bd1..bcd652e0d 100644
--- a/platform/ios/MGLPolyline.m
+++ b/platform/ios/MGLPolyline.m
@@ -4,7 +4,7 @@
 
 @implementation MGLPolyline
 
-@synthesize overlayBounds;
+@dynamic overlayBounds;
 
 + (instancetype)polylineWithCoordinates:(CLLocationCoordinate2D *)coords
                                   count:(NSUInteger)count