any-type.diff

diff --git a/keyserver/src/utils/validation-utils.js b/keyserver/src/utils/validation-utils.js
index 1415cfd24..87a75b188 100644
--- a/keyserver/src/utils/validation-utils.js
+++ b/keyserver/src/utils/validation-utils.js
@@ -2,7 +2,7 @@

 import _mapKeys from 'lodash/fp/mapKeys.js';
 import _mapValues from 'lodash/fp/mapValues.js';
-import type { TType } from 'tcomb';
+import type { TType, TInterface } from 'tcomb';

 import type { PolicyType } from 'lib/facts/policies.js';
 import { hasMinCodeVersion } from 'lib/shared/version-utils.js';
@@ -144,7 +144,7 @@ function findFirstInputMatchingValidator(
   return null;
 }

-function convertObject<T, I: any>(
+function convertObject<T, I>(
   validator: TType<I>,
   input: I,
   typesToConvert: $ReadOnlyArray<TType<T>>,
@@ -170,9 +170,10 @@ function convertObject<T, I: any>(
     );
   }
   if (validator.meta.kind === 'interface' && typeof input === 'object') {
+    const recastValidator: TInterface<typeof input> = (validator: any);
     const result = {};
     for (const key in input) {
-      const innerValidator = validator.meta.props[key];
+      const innerValidator = recastValidator.meta.props[key];
       result[key] = convertObject(
         innerValidator,
         input[key],
@@ -180,7 +181,7 @@ function convertObject<T, I: any>(
         conversionFunction,
       );
     }
-    return assertWithValidator(result, validator);
+    return assertWithValidator(result, recastValidator);
   }
   if (validator.meta.kind === 'union') {
     for (const innerValidator of validator.meta.types) {
@@ -197,9 +198,9 @@ function convertObject<T, I: any>(
   }
   if (validator.meta.kind === 'list' && Array.isArray(input)) {
     const innerValidator = validator.meta.type;
-    return input.map(value =>
+    return (input.map(value =>
       convertObject(innerValidator, value, typesToConvert, conversionFunction),
-    );
+    ): any);
   }
   if (validator.meta.kind === 'dict' && typeof input === 'object') {
     const domainValidator = validator.meta.domain;