diff --git a/test/api/annotations.cpp b/test/api/annotations.cpp
index 336e36ab9..9ec449758 100644
--- a/test/api/annotations.cpp
+++ b/test/api/annotations.cpp
@@ -227,7 +227,7 @@ TEST(Annotations, QueryRenderedFeatures) {
     EXPECT_EQ(*features[0].id, 0);
 
     auto features2 = test.map.queryRenderedFeatures(test.map.pixelForLatLng({ 50, 0 }));
-    EXPECT_EQ(features2.size(), 1);
+    EXPECT_EQ(features2.size(), 1u);
     EXPECT_TRUE(!!features2[0].id);
     EXPECT_EQ(*features2[0].id, 1);
 }