diff --git a/chainspecs/plain_spec_testfinney.json b/chainspecs/plain_spec_testfinney.json
index 1390fe92f2..7f34d0ca35 100644
--- a/chainspecs/plain_spec_testfinney.json
+++ b/chainspecs/plain_spec_testfinney.json
@@ -13,7 +13,9 @@
     "tokenSymbol": "testTAO"
   },
   "forkBlocks": null,
-  "badBlocks": [],
+  "badBlocks": [
+    "0xb5359f22750dd90f088126226669ea4bfcfa802dbc5d7469d294e96cee9b0f17"
+  ],
   "codeSubstitutes": {},
   "genesis": {
     "runtimeGenesis": {
diff --git a/chainspecs/raw_spec_testfinney.json b/chainspecs/raw_spec_testfinney.json
index 08eabf415c..890b88b3ae 100644
--- a/chainspecs/raw_spec_testfinney.json
+++ b/chainspecs/raw_spec_testfinney.json
@@ -13,7 +13,9 @@
     "tokenSymbol": "testTAO"
   },
   "forkBlocks": null,
-  "badBlocks": [],
+  "badBlocks": [
+    "0xb5359f22750dd90f088126226669ea4bfcfa802dbc5d7469d294e96cee9b0f17"
+  ],
   "codeSubstitutes": {},
   "genesis": {
     "raw": {
diff --git a/node/src/chain_spec/testnet.rs b/node/src/chain_spec/testnet.rs
index a3b3d8b627..5bb19773e5 100644
--- a/node/src/chain_spec/testnet.rs
+++ b/node/src/chain_spec/testnet.rs
@@ -45,7 +45,12 @@ pub fn finney_testnet_config() -> Result<ChainSpec, String> {
     Ok(ChainSpec::builder(
         wasm_binary,
         Extensions {
-            bad_blocks: Some(HashSet::new()),
+            bad_blocks: Some(HashSet::from_iter(vec![
+                H256::from_str(
+                    "0xb5359f22750dd90f088126226669ea4bfcfa802dbc5d7469d294e96cee9b0f17",
+                )
+                .unwrap(),
+            ])),
             ..Default::default()
         },
     )