diff --git a/CHANGELOG.md b/CHANGELOG.md
index 81b7cc1eb0..a588eef74c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # 1.14.0-beta.x
 
+- Align imOnline `Heartbeats` with Substrate (Thanks to https://github.com/arjanz)
 - Ensure metadata is only requested once upon startup
 
 # 1.13.1 May 6, 2020
diff --git a/packages/types/src/interfaces/imOnline/definitions.ts b/packages/types/src/interfaces/imOnline/definitions.ts
index 9c7122788f..3bffcc6831 100644
--- a/packages/types/src/interfaces/imOnline/definitions.ts
+++ b/packages/types/src/interfaces/imOnline/definitions.ts
@@ -19,6 +19,12 @@ export default {
       authorityIndex: 'AuthIndex',
       validatorsLen: 'u32'
     },
+    HeartbeatTo244: {
+      blockNumber: 'BlockNumber',
+      networkState: 'OpaqueNetworkState',
+      sessionIndex: 'SessionIndex',
+      authorityIndex: 'AuthIndex'
+    },
     OpaqueMultiaddr: 'Bytes',
     OpaquePeerId: 'Bytes',
     OpaqueNetworkState: {