diff --git a/src/erc7730/lint/lint.py b/src/erc7730/lint/lint.py
index 9224613..bd927bf 100644
--- a/src/erc7730/lint/lint.py
+++ b/src/erc7730/lint/lint.py
@@ -51,9 +51,8 @@ def lint_all(paths: list[Path], out: OutputAdder) -> int:
     :param out: output adder
     :return: number of files checked
     """
-    linter = MultiLinter(
-        [ValidateABILinter(), ValidateDisplayFieldsLinter(), ClassifyTransactionTypeLinter(), DefinitionLinter()]
-    )
+    input_linter = DefinitionLinter()
+    output_linter = MultiLinter([ValidateABILinter(), ValidateDisplayFieldsLinter(), ClassifyTransactionTypeLinter()])
 
     files = list(get_erc7730_files(*paths, out=out))
 
@@ -67,7 +66,11 @@ def label(f: Path) -> Path | None:
         print(f"🔍 checking {len(files)} descriptor files…\n")
 
     with ThreadPoolExecutor() as executor:
-        for future in (executor.submit(lint_file, file, linter, out, label(file)) for file in files):
+        for future in (executor.submit(lint_file, file, input_linter, out, label(file)) for file in files):
+            future.result()
+
+    with ThreadPoolExecutor() as executor:
+        for future in (executor.submit(lint_file, file, output_linter, out, label(file)) for file in files):
             future.result()
 
     return len(files)
diff --git a/src/erc7730/lint/lint_validate_definitions.py b/src/erc7730/lint/lint_validate_definitions.py
index ceaa013..85c7c80 100644
--- a/src/erc7730/lint/lint_validate_definitions.py
+++ b/src/erc7730/lint/lint_validate_definitions.py
@@ -14,15 +14,18 @@ class DefinitionLinter(ERC7730Linter):
     @override
     def lint(self, descriptor: ResolvedERC7730Descriptor | InputERC7730Descriptor, out: OutputAdder) -> None:
         if isinstance(descriptor, InputERC7730Descriptor) and descriptor.display.definitions is not None:
-            for _, definition in descriptor.display.definitions.items():
+            for name, _ in descriptor.display.definitions.items():
                 found = False
                 for _, format in descriptor.display.formats.items():
                     if found is False:
                         for field in format.fields:
-                            if isinstance(field, InputReference) and field.ref == definition.label:
+                            if (
+                                isinstance(field, InputReference)
+                                and field.ref.__str__() == f"$.display.definitions.{name}"
+                            ):
                                 found = True
                 if found is False:
                     out.error(
                         title="Unused field definition",
-                        message=f"Field {definition.label} is not used in descriptor formats.",
+                        message=f"Field {name} is not used in descriptor formats.",
                     )
diff --git a/tests/lint/resources/calldata-unused-definitions.json b/tests/lint/resources/calldata-unused-definitions.json
new file mode 100644
index 0000000..2371d46
--- /dev/null
+++ b/tests/lint/resources/calldata-unused-definitions.json
@@ -0,0 +1,71 @@
+{
+    "context": {
+        "$id": "AugustusSwapper",
+        "contract" : {
+            "abi": "https://github.com/LedgerHQ/ledger-asset-dapps/blob/main/ethereum/paraswap/abis/0x1bd435f3c054b6e901b7b108a0ab7617c808677b.abi.json",
+            "deployments": [
+                {
+                    "chainId": 1,
+                    "address": "0x1bd435f3c054b6e901b7b108a0ab7617c808677b"        
+                },
+                {
+                    "chainId": 1,
+                    "address": "0xdef171fe48cf0115b1d80b88dc8eab59176fee57"        
+                },
+                {
+                    "chainId": 56,
+                    "address": "0x55a0e3b6579972055faa983482aceb4b251dcf15"        
+                },
+                {
+                    "chainId": 56,
+                    "address": "0xdef171fe48cf0115b1d80b88dc8eab59176fee57"        
+                },
+                {
+                    "chainId": 137,
+                    "address": "0x90249ed4d69d70e709ffcd8bee2c5a566f65dade"        
+                },
+                {
+                    "chainId": 137,
+                    "address": "0xdef171fe48cf0115b1d80b88dc8eab59176fee57"        
+                }
+            ]
+        }
+    },
+
+    "metadata": {
+        "owner": "Paraswap"
+    },
+    
+    "display": {
+        "definitions": {
+            "amountIn": {
+                "label": "Income Amount",
+                "format": "amount"
+            },
+            "amountOut": {
+                "label": "Outcome Amount",
+                "format": "amount"
+            },
+            "amountOutIn": {
+                "label": "Outcome/Income Amount",
+                "format": "amount"
+            }
+        },
+        "formats": {
+            "0xcfc0afeb" : {
+                "$id": "swapOnZeroXv2",
+                "fields": [
+                    {
+                        "path": "amountIn",
+                        "$ref": "$.display.definitions.amountIn"
+                    },
+                    {
+                        "path": "amountOut",
+                        "$ref": "$.display.definitions.amountOut"
+                    }
+                ],
+                "required": ["amountIn", "amountOut"]
+            }
+        }
+    }
+}
diff --git a/tests/lint/test_lint.py b/tests/lint/test_lint.py
index db198b2..cb530f3 100644
--- a/tests/lint/test_lint.py
+++ b/tests/lint/test_lint.py
@@ -2,10 +2,13 @@
 
 import pytest
 
-from erc7730.lint.lint import lint_all_and_print_errors
+from erc7730.common.output import SetOutputAdder
+from erc7730.lint.lint import lint_all, lint_all_and_print_errors
 from tests.cases import path_id
 from tests.files import ERC7730_DESCRIPTORS
 
+RESOURCES = Path(__file__).resolve().parent / "resources"
+
 
 @pytest.mark.parametrize("input_file", ERC7730_DESCRIPTORS, ids=path_id)
 def test_registry_files(input_file: Path) -> None:
@@ -18,3 +21,18 @@ def test_registry_files(input_file: Path) -> None:
         pytest.skip("Descriptor uses literal constants instead of token paths, which is not supported yet")
 
     assert lint_all_and_print_errors([input_file])
+
+
+def test_unused_definition_detected_by_linter() -> None:
+    """
+    Test unused field definition is detected within an ERC-7730 file
+    """
+    output_adder = SetOutputAdder()
+
+    input_file = RESOURCES / "calldata-unused-definitions.json"
+
+    lint_all([input_file], output_adder)
+
+    assert output_adder.has_errors is True
+
+    assert "Unused field definition" in (set(map(lambda x: x.title, output_adder.outputs)))