diff --git a/src/rest.cpp b/src/rest.cpp
index c9e61d70bd0..ba149c1a9ec 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -627,7 +627,7 @@ static bool rest_deploymentinfo(const std::any& context, HTTPRequest* req, const
                 return RESTERR(req, HTTP_BAD_REQUEST, "Block not found");
             }
 
-            jsonRequest.params.pushKV("blockhash", hash_str);
+            jsonRequest.params.push_back(hash_str);
         }
 
         req->WriteHeader("Content-Type", "application/json");
diff --git a/test/functional/interface_rest.py b/test/functional/interface_rest.py
index 315d7179869..1ba8f60d99c 100755
--- a/test/functional/interface_rest.py
+++ b/test/functional/interface_rest.py
@@ -421,6 +421,10 @@ class RESTTest (BitcoinTestFramework):
         deployment_info = self.nodes[0].getdeploymentinfo()
         assert_equal(deployment_info, self.test_rest_request('/deploymentinfo'))
 
+        previous_bb_hash = self.nodes[0].getblockhash(self.nodes[0].getblockcount() - 1)
+        deployment_info = self.nodes[0].getdeploymentinfo(previous_bb_hash)
+        assert_equal(deployment_info, self.test_rest_request(f"/deploymentinfo/{previous_bb_hash}"))
+
         non_existing_blockhash = '42759cde25462784395a337460bde75f58e73d3f08bd31fdc3507cbac856a2c4'
         resp = self.test_rest_request(f'/deploymentinfo/{non_existing_blockhash}', ret_type=RetType.OBJ, status=400)
         assert_equal(resp.read().decode('utf-8').rstrip(), "Block not found")