diff --git a/tests/test_gateway_result_code.py b/tests/test_gateway_result_code.py
new file mode 100644
index 0000000..73e446b
--- /dev/null
+++ b/tests/test_gateway_result_code.py
@@ -0,0 +1,15 @@
+# flake8: noqa
+
+import pytest
+
+from wirepas_mesh_messaging.proto import ErrorCode
+from wirepas_mesh_messaging import GatewayResultCode
+
+@pytest.mark.parametrize("protobuf_result_code", ErrorCode.items())
+def test_decoding_errors(protobuf_result_code):
+    name, value = protobuf_result_code
+    try:
+        GatewayResultCode(value)
+    except ValueError as e:
+        raise ValueError(f"{name} is not defined in GatewayResultCode") from e
+
diff --git a/wirepas_mesh_messaging/gateway_result_code.py b/wirepas_mesh_messaging/gateway_result_code.py
index 738cc14..2d449df 100644
--- a/wirepas_mesh_messaging/gateway_result_code.py
+++ b/wirepas_mesh_messaging/gateway_result_code.py
@@ -50,3 +50,5 @@ class GatewayResultCode(enum.Enum):
     GW_RES_INVALID_MAX_HOP_COUNT = INVALID_MAX_HOP_COUNT
     GW_RES_SINK_OUT_OF_MEMORY = SINK_OUT_OF_MEMORY
     GW_RES_SINK_TIMEOUT = SINK_TIMEOUT
+    GW_RES_INVALID_SCRATCHPAD_CHUNK_OFFSET = INVALID_SCRATCHPAD_CHUNK_OFFSET
+    GW_RES_INVALID_SCRATCHPAD_CHUNK_SIZE = INVALID_SCRATCHPAD_CHUNK_SIZE