diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2570,7 +2570,7 @@
             // If this is a parked chain, but it has enough PoW, clear the park
             // state.
             bool fParkedChain = pindexTest->nStatus.isOnParkedChain();
-            if (fParkedChain && gArgs.GetBoolArg("-parkdeepreorg", true)) {
+            if (fParkedChain) {
                 const CBlockIndex *pindexTip = chainActive.Tip();
 
                 // During initialization, pindexTip and/or pindexFork may be
diff --git a/test/functional/abc-parkedchain.py b/test/functional/abc-parkedchain.py
--- a/test/functional/abc-parkedchain.py
+++ b/test/functional/abc-parkedchain.py
@@ -5,7 +5,7 @@
 """Test the parckblock and unparkblock RPC calls."""
 
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, wait_until
+from test_framework.util import assert_equal, connect_nodes_bi, wait_until
 
 
 class ParkedChainTest(BitcoinTestFramework):
@@ -188,6 +188,29 @@
         check_reorg_protection(6, 6)
         check_reorg_protection(100, 100)
 
+        self.log.info("Test that unparking works when -parkdeepreorg=0")
+        # Set up parking node height = fork + 4, node height = fork + 5
+        node.invalidateblock(node.getbestblockhash())
+        parking_node.generate(3)
+        node.generate(5)
+        wait_for_parked_block(node.getbestblockhash())
+        # Restart the parking node without parkdeepreorg.
+        self.restart_node(1, ["-parkdeepreorg=0"])
+        parking_node = self.nodes[1]
+        connect_nodes_bi(node, parking_node)
+        # The other chain should still be marked 'parked'.
+        wait_for_parked_block(node.getbestblockhash())
+        # Two more blocks is not enough to unpark. Even though PoW is larger
+        # we are still following the delayed-unparking rules.
+        node.generate(2)
+        wait_for_parked_block(node.getbestblockhash())
+        # Final block pushes over the edge, and should unpark.
+        node.generate(1)
+        wait_until(lambda: parking_node.getbestblockhash()
+                   == node.getbestblockhash(), timeout=5)
+        # Do not append tests after this point without restarting node again.
+        # Parking node is no longer parking.
+
 
 if __name__ == '__main__':
     ParkedChainTest().main()