diff --git a/lib/types/minimally-encoded-thread-permissions-types.js b/lib/types/minimally-encoded-thread-permissions-types.js
--- a/lib/types/minimally-encoded-thread-permissions-types.js
+++ b/lib/types/minimally-encoded-thread-permissions-types.js
@@ -7,11 +7,11 @@
 import type { ThreadPermissionsInfo } from './thread-permission-types.js';
 import type { ThreadType } from './thread-types-enum.js';
 import type {
+  ClientLegacyRoleInfo,
   LegacyMemberInfo,
   LegacyRawThreadInfo,
-  LegacyThinRawThreadInfo,
   LegacyThickRawThreadInfo,
-  ClientLegacyRoleInfo,
+  LegacyThinRawThreadInfo,
   LegacyThreadCurrentUserInfo,
   ThickMemberInfo,
 } from './thread-types.js';
@@ -114,13 +114,6 @@
   { +permissions: string },
 >;
 
-function stripPermissionsFromMemberInfo(
-  memberInfo: MemberInfoWithPermissions,
-): MemberInfoSansPermissions {
-  const { permissions, ...rest } = memberInfo;
-  return rest;
-}
-
 export type MinimallyEncodedThickMemberInfo = $ReadOnly<{
   ...ThickMemberInfo,
   +minimallyEncoded: true,
@@ -294,7 +287,6 @@
   decodeMinimallyEncodedRoleInfo,
   minimallyEncodeThreadCurrentUserInfo,
   decodeMinimallyEncodedThreadCurrentUserInfo,
-  stripPermissionsFromMemberInfo,
   minimallyEncodeMemberInfo,
   decodeMinimallyEncodedMemberInfo,
   deprecatedMinimallyEncodeRawThreadInfo,
diff --git a/lib/utils/member-info-utils.js b/lib/utils/member-info-utils.js
new file mode 100644
--- /dev/null
+++ b/lib/utils/member-info-utils.js
@@ -0,0 +1,15 @@
+// @flow
+
+import type {
+  MemberInfoSansPermissions,
+  MemberInfoWithPermissions,
+} from '../types/minimally-encoded-thread-permissions-types.js';
+
+function stripPermissionsFromMemberInfo(
+  memberInfo: MemberInfoWithPermissions,
+): MemberInfoSansPermissions {
+  const { permissions, ...rest } = memberInfo;
+  return rest;
+}
+
+export { stripPermissionsFromMemberInfo };
diff --git a/lib/types/minimally-encoded-thread-permissions-types.test.js b/lib/utils/member-info-utils.test.js
rename from lib/types/minimally-encoded-thread-permissions-types.test.js
rename to lib/utils/member-info-utils.test.js
--- a/lib/types/minimally-encoded-thread-permissions-types.test.js
+++ b/lib/utils/member-info-utils.test.js
@@ -1,10 +1,10 @@
 // @flow
 
+import { stripPermissionsFromMemberInfo } from './member-info-utils.js';
 import type {
   MemberInfoSansPermissions,
   MemberInfoWithPermissions,
-} from './minimally-encoded-thread-permissions-types.js';
-import { stripPermissionsFromMemberInfo } from './minimally-encoded-thread-permissions-types.js';
+} from '../types/minimally-encoded-thread-permissions-types.js';
 
 describe('stripPermissionsFromMemberInfo', () => {
   test('should produce valid MemberInfoSansPermissions', () => {