diff --git a/packages/types/README.md b/packages/types/README.md
index 5842d26230..6dc0c1d7e7 100644
--- a/packages/types/README.md
+++ b/packages/types/README.md
@@ -105,7 +105,7 @@ These custom types implement specific types that are found as part of the Substr
 | [[InherentOfflineReport]] | Describes the offline-reporting extrinsic |
 | [[Justification]] | A generic justification as a stream of [[Bytes]], this is specific per consensus implementation |
 | [[Key]] | The Substrate Key representation as a [[Bytes]] (`vec<u8>`) |
-| [[Keys]] | The session keys |
+| [[Keys]] | The session keys for both Grandpa (ed25519) and Babe (sr25519) |
 | [[KeyValue]] |  KeyValue structure. Since most of the keys and resultant values in Subtrate are hashed and/or encoded, keys and values are reprsented as [[Bytes]] |
 | [[KeyValueOption]] | A key/value change. Similar to the [[KeyValue]] structure, but the value can be optional |
 | [[LockIdentifier]] | The Substrate LockIdentifier for staking |
@@ -132,7 +132,6 @@ These custom types implement specific types that are found as part of the Substr
 | [[SeedOf]] | The Substrate SeedOf representation as a [[Hash]] |
 | [[SessionIndex]] | Simple index type with which we can count sessions as [[U32]] |
 | [[SessionKey]] | Wrapper for a SessionKey. Same as an normal [[AuthorityId]], i.e. a wrapper around publicKey |
-| [[SessionKeys]] | Wrapper for the session and authority ids |
 | [[SetIndex]] | Set index, implemented as a [[U32]] |
 | [[StakingLedger]] | The ledger of a (bonded) stash |
 | [[StoredPendingChange]] | Stored pending change for a Grandpa events |
diff --git a/packages/types/src/interfaceRegistry.ts b/packages/types/src/interfaceRegistry.ts
index abc9e9d6af..d853bd1b11 100644
--- a/packages/types/src/interfaceRegistry.ts
+++ b/packages/types/src/interfaceRegistry.ts
@@ -2,7 +2,7 @@
 
 import { Compact, Option, Vec } from './codec';
 import { Bytes, Data, Fixed64, H160, H256, H512, Moment, Null, StorageHasher, StorageKey, Text, Type, bool, i128, i16, i256, i32, i64, i8, u128, u16, u256, u32, u64, u8, usize } from './primitive';
-import { AccountId, AccountIdOf, AccountIndex, Address, Balance, BalanceOf, Block, BlockNumber, Consensus, ConsensusEngineId, Digest, DigestItem, Ed25519Signature, Extrinsic, ExtrinsicEra, ExtrinsicPayload, Hash, Header, ImmortalEra, Index, Justification, KeyTypeId, KeyValue, LockIdentifier, Method, MortalEra, Origin, Perbill, Permill, Phantom, PreRuntime, Seal, SealV0, SessionKeys, Signature, SignedBlock, Sr25519Signature, StorageData, ValidatorId, Weight, WeightMultiplier } from './interfaces/runtime';
+import { AccountId, AccountIdOf, AccountIndex, Address, Balance, BalanceOf, Block, BlockNumber, Consensus, ConsensusEngineId, Digest, DigestItem, Ed25519Signature, Extrinsic, ExtrinsicEra, ExtrinsicPayload, Hash, Header, ImmortalEra, Index, Justification, KeyTypeId, KeyValue, LockIdentifier, Method, MortalEra, Origin, Perbill, Permill, Phantom, PreRuntime, Seal, SealV0, Signature, SignedBlock, Sr25519Signature, StorageData, ValidatorId, Weight, WeightMultiplier } from './interfaces/runtime';
 import { AuthorityId } from './interfaces/consensus';
 import { Keys, SessionIndex } from './interfaces/session';
 import { AuthorityWeight, NextAuthority, PendingPause, PendingResume, StoredPendingChange, StoredState } from './interfaces/grandpa';
@@ -200,9 +200,6 @@ export interface InterfaceRegistry {
   Phantom: Phantom;
   'Option<Phantom>': Option<Phantom>;
   'Vec<Phantom>': Vec<Phantom>;
-  SessionKeys: SessionKeys;
-  'Option<SessionKeys>': Option<SessionKeys>;
-  'Vec<SessionKeys>': Vec<SessionKeys>;
   StorageData: StorageData;
   'Option<StorageData>': Option<StorageData>;
   'Vec<StorageData>': Vec<StorageData>;
diff --git a/packages/types/src/interfaces/runtime/definitions.ts b/packages/types/src/interfaces/runtime/definitions.ts
index 7d334ffd56..4878393897 100644
--- a/packages/types/src/interfaces/runtime/definitions.ts
+++ b/packages/types/src/interfaces/runtime/definitions.ts
@@ -48,9 +48,6 @@ export default {
     Perbill: 'u32',
     Permill: 'u32',
     Phantom: 'Null',
-    SessionKeys: {
-      ed25519: 'AccountId'
-    },
     StorageData: 'Bytes',
     KeyValue: '(StorageKey, StorageData)',
     ValidatorId: 'AccountId',
diff --git a/packages/types/src/interfaces/runtime/types.ts b/packages/types/src/interfaces/runtime/types.ts
index f35d8010dc..2bc21fa0a5 100644
--- a/packages/types/src/interfaces/runtime/types.ts
+++ b/packages/types/src/interfaces/runtime/types.ts
@@ -114,12 +114,6 @@ export type Seal = [ConsensusEngineId, Bytes] & Codec;
 /** [u64, Signature] & Codec */
 export type SealV0 = [u64, Signature] & Codec;
 
-/** Struct */
-export interface SessionKeys extends Struct {
-  /** AccountId */
-  readonly ed25519: AccountId;
-}
-
 /** H512 */
 export type Signature = H512;
 
diff --git a/packages/types/src/interfaces/session/definitions.ts b/packages/types/src/interfaces/session/definitions.ts
index c7ae5bcf46..d3c5638bb3 100644
--- a/packages/types/src/interfaces/session/definitions.ts
+++ b/packages/types/src/interfaces/session/definitions.ts
@@ -5,6 +5,10 @@
 export default {
   types: {
     SessionIndex: 'u32',
-    Keys: 'SessionKeys'
+    // node/runtime/src/lib.rs, impl_opaque_keys
+    Keys: {
+      ed25519: 'AccountId', // Grandpa, aka GrandpaId
+      sr25519: 'AccountId' // Babe, aka BabeId
+    }
   }
 };
diff --git a/packages/types/src/interfaces/session/types.ts b/packages/types/src/interfaces/session/types.ts
index bf3a17a031..bcde8dc43b 100644
--- a/packages/types/src/interfaces/session/types.ts
+++ b/packages/types/src/interfaces/session/types.ts
@@ -1,10 +1,16 @@
 // Auto-generated via `yarn build:interfaces`, do not edit
 
+import { Struct } from '../../codec';
 import { u32 } from '../../primitive';
-import { SessionKeys } from '../runtime';
+import { AccountId } from '../runtime';
 
-/** SessionKeys */
-export type Keys = SessionKeys;
+/** Struct */
+export interface Keys extends Struct {
+  /** AccountId */
+  readonly ed25519: AccountId;
+  /** AccountId */
+  readonly sr25519: AccountId;
+}
 
 /** u32 */
 export type SessionIndex = u32;