diff --git a/test/api/set_style.cpp b/test/api/set_style.cpp
index 5a5013acc..973989d1c 100644
--- a/test/api/set_style.cpp
+++ b/test/api/set_style.cpp
@@ -28,5 +28,6 @@ TEST(API, SetStyle) {
     auto flo = dynamic_cast<FixtureLogObserver*>(observer.get());
     EXPECT_EQ(1ul, flo->count({ EventSeverity::Error, Event::ParseStyle, -1,
         "Error parsing style JSON at 0: Expect either an object or array at root" }));
-    EXPECT_TRUE(flo->unchecked().empty());
+    auto unchecked = flo->unchecked();
+    EXPECT_TRUE(unchecked.empty()) << unchecked;
 }