diff --git a/test/ipmi_interface_mock.hpp b/test/ipmi_interface_mock.hpp
index bee3da4..2fac71d 100644
--- a/test/ipmi_interface_mock.hpp
+++ b/test/ipmi_interface_mock.hpp
@@ -8,5 +8,6 @@
 {
   public:
     virtual ~IpmiInterfaceMock() = default;
-    MOCK_METHOD1(sendPacket, int(const std::vector<std::uint8_t>&));
+    MOCK_METHOD1(sendPacket,
+                 std::vector<std::uint8_t>(const std::vector<std::uint8_t>&));
 };