diff --git a/platform/ios/MGLMapView.mm b/platform/ios/MGLMapView.mm
index 63cca9210..fefb77d11 100644
--- a/platform/ios/MGLMapView.mm
+++ b/platform/ios/MGLMapView.mm
@@ -1139,7 +1139,7 @@ std::chrono::steady_clock::duration MGLDurationInSeconds(float duration)
         if (hitAnnotationTag != _selectedAnnotationTag)
         {
             id <MGLAnnotation> annotation = [self annotationWithTag:hitAnnotationTag];
-            NSAssert(annotation, @"Cannot select nonexistent annotation with tag %i", hitAnnotationTag);
+            NSAssert(annotation, @"Cannot select nonexistent annotation with tag %u", hitAnnotationTag);
             [self selectAnnotation:annotation animated:YES];
         }
     }
diff --git a/platform/osx/src/MGLMapView.mm b/platform/osx/src/MGLMapView.mm
index 39fcb3245..bc7309aae 100644
--- a/platform/osx/src/MGLMapView.mm
+++ b/platform/osx/src/MGLMapView.mm
@@ -1205,7 +1205,7 @@ public:
     if (hitAnnotationTag != MGLAnnotationTagNotFound) {
         if (hitAnnotationTag != _selectedAnnotationTag) {
             id <MGLAnnotation> annotation = [self annotationWithTag:hitAnnotationTag];
-            NSAssert(annotation, @"Cannot select nonexistent annotation with ID %i", hitAnnotationTag);
+            NSAssert(annotation, @"Cannot select nonexistent annotation with tag %u", hitAnnotationTag);
             [self selectAnnotation:annotation];
         }
     } else {