1 files changed, 1 insertions, 1 deletions
diff --git a/test/style/style_layer.test.cpp b/test/style/style_layer.test.cpp
index 624ed088c3..61516a2de9 100644
--- a/test/style/style_layer.test.cpp
+++ b/test/style/style_layer.test.cpp
@@ -285,7 +285,7 @@ TEST(Layer, DuplicateLayer) {
     try {
         style.addLayer(std::make_unique<LineLayer>("line", "unusedsource"));
         FAIL() << "Should not have been allowed to add a duplicate layer id";
-    } catch (const std::runtime_error e) {
+    } catch (const std::runtime_error& e) {
         // Expected
         ASSERT_STREQ("Layer line already exists", e.what());
     }