diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -1826,8 +1826,8 @@
                                 const JSONRPCRequest &request) {
     RPCHelpMan{
         "reconsiderblock",
-        "Removes invalidity status of a block and its descendants, "
-        "reconsider them for activation.\n"
+        "Removes invalidity status of a block, its ancestors and its"
+        "descendants, reconsider them for activation.\n"
         "This can be used to undo the effects of invalidateblock.\n",
         {
             {"blockhash", RPCArg::Type::STR_HEX, RPCArg::Optional::NO,
diff --git a/test/functional/rpc_invalidateblock.py b/test/functional/rpc_invalidateblock.py
--- a/test/functional/rpc_invalidateblock.py
+++ b/test/functional/rpc_invalidateblock.py
@@ -4,12 +4,12 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the invalidateblock RPC."""
 
-import time
-
+from test_framework.address import ADDRESS_BCHREG_UNSPENDABLE
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
     connect_nodes,
+    wait_until,
 )
 
 
@@ -28,51 +28,70 @@
         self.log.info("Mine 4 blocks on Node 0")
         self.nodes[0].generatetoaddress(
             4, self.nodes[0].get_deterministic_priv_key().address)
-        assert self.nodes[0].getblockcount() == 4
-        besthash = self.nodes[0].getbestblockhash()
+        assert_equal(self.nodes[0].getblockcount(), 4)
+        besthash_n0 = self.nodes[0].getbestblockhash()
 
         self.log.info("Mine competing 6 blocks on Node 1")
         self.nodes[1].generatetoaddress(
             6, self.nodes[1].get_deterministic_priv_key().address)
-        assert self.nodes[1].getblockcount() == 6
+        assert_equal(self.nodes[1].getblockcount(), 6)
 
         self.log.info("Connect nodes to force a reorg")
         connect_nodes(self.nodes[0], self.nodes[1])
         self.sync_blocks(self.nodes[0:2])
-        assert self.nodes[0].getblockcount() == 6
+        assert_equal(self.nodes[0].getblockcount(), 6)
         badhash = self.nodes[1].getblockhash(2)
 
         self.log.info(
             "Invalidate block 2 on node 0 and verify we reorg to node 0's original chain")
         self.nodes[0].invalidateblock(badhash)
-        newheight = self.nodes[0].getblockcount()
-        newhash = self.nodes[0].getbestblockhash()
-        if (newheight != 4 or newhash != besthash):
-            raise AssertionError(
-                "Wrong tip for node0, hash {}, height {}".format(newhash, newheight))
+        assert_equal(self.nodes[0].getblockcount(), 4)
+        assert_equal(self.nodes[0].getbestblockhash(), besthash_n0)
 
         self.log.info("\nMake sure we won't reorg to a lower work chain:")
         connect_nodes(self.nodes[1], self.nodes[2])
         self.log.info("Sync node 2 to node 1 so both have 6 blocks")
         self.sync_blocks(self.nodes[1:3])
-        assert self.nodes[2].getblockcount() == 6
+        assert_equal(self.nodes[2].getblockcount(), 6)
         self.log.info("Invalidate block 5 on node 1 so its tip is now at 4")
         self.nodes[1].invalidateblock(self.nodes[1].getblockhash(5))
-        assert self.nodes[1].getblockcount() == 4
+        assert_equal(self.nodes[1].getblockcount(), 4)
         self.log.info("Invalidate block 3 on node 2, so its tip is now 2")
         self.nodes[2].invalidateblock(self.nodes[2].getblockhash(3))
-        assert self.nodes[2].getblockcount() == 2
+        assert_equal(self.nodes[2].getblockcount(), 2)
         self.log.info("..and then mine a block")
         self.nodes[2].generatetoaddress(
             1, self.nodes[2].get_deterministic_priv_key().address)
         self.log.info("Verify all nodes are at the right height")
-        time.sleep(5)
-        assert_equal(self.nodes[2].getblockcount(), 3)
-        assert_equal(self.nodes[0].getblockcount(), 4)
-        node1height = self.nodes[1].getblockcount()
-        if node1height < 4:
-            raise AssertionError(
-                "Node 1 reorged to a lower height: {}".format(node1height))
+        wait_until(lambda: self.nodes[2].getblockcount() == 3, timeout=5)
+        wait_until(lambda: self.nodes[0].getblockcount() == 4, timeout=5)
+        wait_until(lambda: self.nodes[1].getblockcount() == 4, timeout=5)
+
+        self.log.info("Verify that we reconsider all ancestors as well")
+        blocks = self.nodes[1].generatetoaddress(
+            10, ADDRESS_BCHREG_UNSPENDABLE)
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-1])
+        # Invalidate the two blocks at the tip
+        self.nodes[1].invalidateblock(blocks[-1])
+        self.nodes[1].invalidateblock(blocks[-2])
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-3])
+        # Reconsider only the previous tip
+        self.nodes[1].reconsiderblock(blocks[-1])
+        # Should be back at the tip by now
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-1])
+
+        self.log.info("Verify that we reconsider all descendants")
+        blocks = self.nodes[1].generatetoaddress(
+            10, ADDRESS_BCHREG_UNSPENDABLE)
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-1])
+        # Invalidate the two blocks at the tip
+        self.nodes[1].invalidateblock(blocks[-2])
+        self.nodes[1].invalidateblock(blocks[-4])
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-5])
+        # Reconsider only the previous tip
+        self.nodes[1].reconsiderblock(blocks[-4])
+        # Should be back at the tip by now
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-1])
 
 
 if __name__ == '__main__':