diff --git a/CHANGELOG.md b/CHANGELOG.md
index f84c6cf..5d8f064 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -194,6 +194,9 @@ Notable changes to Cloudfall. The format follows
 
 ### Fixed
 
+- `migrate --env-file NAME=PATH` and `--data NAME=PATH` resolve a relative
+  path against the project again, as every other path does; since the
+  move to treaty they resolved against the current directory
 - `migrate --build` and the `cloudfall-mcp` `build_artifact` tool read the
   release from the engine's treaty envelope, under `data`. Since the engine
   moved to treaty every build step failed with "artifact builder returned no
diff --git a/sdk/src/cloudfall/app.py b/sdk/src/cloudfall/app.py
index 6634477..5f0475d 100644
--- a/sdk/src/cloudfall/app.py
+++ b/sdk/src/cloudfall/app.py
@@ -2078,12 +2078,13 @@ def options(self, fleet: Fleet) -> MigrateOptions:
             plan_file=fleet.path(self.plan_file),
             builds=_pairs(self.build, "build"),
             releases=_pairs(self.release, "release"),
+            # Relative to the project, as every other path here is.
             environment_files={
-                component: Path(value)
+                component: fleet.path(Path(value))
                 for component, value in _pairs(self.env_file, "env-file").items()
             },
             data_migrations={
-                database: Path(value)
+                database: fleet.path(Path(value))
                 for database, value in _pairs(self.data, "data").items()
             },
             execute=self.yes,
diff --git a/sdk/tests/test_app.py b/sdk/tests/test_app.py
index 80d6915..272c30a 100644
--- a/sdk/tests/test_app.py
+++ b/sdk/tests/test_app.py
@@ -7,13 +7,16 @@
 from pathlib import Path
 
 import pytest
-from cloudfall.app import app
+from cloudfall.app import Fleet, MigrateArgs, app
 from cloudfall.cli import main
 from cloudfall.commands import CLI_COMMANDS
+from cloudfall.resources import default_schema_directory
+from cloudfall.validation import validate_config
 
 ROOT = Path(__file__).parents[2]
 EXAMPLES = ROOT / "config" / "examples"
 COMPLIANT = ROOT / "config" / "tests" / "observed" / "compliant"
+SCHEMAS = default_schema_directory()
 
 
 def test_the_contract_marks_exactly_the_commands_treaty_runs() -> None:
@@ -84,3 +87,21 @@ def test_a_drift_report_keeps_the_order_the_checks_ran_in(
     report = json.loads(capsys.readouterr().out)["data"]
     assert code == 83
     assert report["servers"][0]["checks"][0]["check"] == "server_type.id"
+
+
+def test_migrate_resolves_env_and_data_files_against_the_project(
+    tmp_path: Path,
+) -> None:
+    """The argparse CLI ran migrate inside the project; relative paths meant it."""
+    fleet = Fleet(EXAMPLES, validate_config(EXAMPLES, SCHEMAS))
+    args = MigrateArgs(
+        env_file=("crm-backend=tmp/env/crm.env",),
+        data=(f"crm={tmp_path / 'source.url'}",),
+    )
+
+    options = args.options(fleet)
+
+    assert options.environment_files == {
+        "crm-backend": EXAMPLES / "tmp/env/crm.env"
+    }
+    assert options.data_migrations == {"crm": tmp_path / "source.url"}