diff --git a/test/message/append.cpp b/test/message/append.cpp
index 6485d99..de40ef6 100644
--- a/test/message/append.cpp
+++ b/test/message/append.cpp
@@ -42,7 +42,8 @@
             nullptr, nullptr, nullptr, nullptr);
     }
 
-    template <typename T> void expect_basic(char type, T val)
+    template <typename T>
+    void expect_basic(char type, T val)
     {
         EXPECT_CALL(mock,
                     sd_bus_message_append_basic(