diff --git a/src/compose/utils.ts b/src/compose/utils.ts
index 2dc2c9aa..6dff295d 100644
--- a/src/compose/utils.ts
+++ b/src/compose/utils.ts
@@ -458,5 +458,5 @@ export function normalizeLabels(
 	});
 	const balenaLabels = _.pickBy(labels, (_v, k) => _.startsWith(k, 'io.balena.'));
 	const otherLabels = _.pickBy(labels, (_v, k) => !(_.startsWith(k, 'io.balena.') || _.startsWith(k, 'io.resin.')));
-	return _.assign({}, otherLabels, legacyLabels, balenaLabels);
+	return _.assign({}, otherLabels, legacyLabels, balenaLabels) as { [key: string]: string };
 }