diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 964384f..1454f11 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -35,6 +35,7 @@ jobs:
           - default
           - netns
           - netnsRegtest
+          - joinmarket-bitcoind-29
     needs: build_test_drivers
     if: needs.build_test_drivers.outputs.run_scenario_tests == 'true'
     steps:
diff --git a/modules/joinmarket.nix b/modules/joinmarket.nix
index 151092d..1ea6684 100644
--- a/modules/joinmarket.nix
+++ b/modules/joinmarket.nix
@@ -251,6 +251,19 @@ in {
   }
 
   (mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = lib.versionOlder bitcoind.package.version "30";
+        message = ''
+          Joinmarket is not compatible with bitcoind >= 30.
+          (https://github.com/JoinMarket-Org/joinmarket-clientserver/pull/1775)
+
+          To fix this, add the following to your config:
+          services.bitcoind.package = config.nix-bitcoin.pkgs.bitcoind_29;
+        '';
+      }
+    ];
+
     services.bitcoind = {
       enable = true;
       disablewallet = false;
diff --git a/modules/netns-isolation.nix b/modules/netns-isolation.nix
index 602eb7f..9357503 100644
--- a/modules/netns-isolation.nix
+++ b/modules/netns-isolation.nix
@@ -341,7 +341,7 @@ in {
     services.nbxplorer.address = netns.nbxplorer.address;
     services.btcpayserver.address = netns.btcpayserver.address;
 
-    services.joinmarket = {
+    services.joinmarket = mkIf config.services.joinmarket.enable {
       payjoinAddress = netns.joinmarket.address;
       messagingAddress = netns.joinmarket.address;
       cliExec = mkCliExec "joinmarket";
diff --git a/pkgs/default.nix b/pkgs/default.nix
index 97f705d..737bfba 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -25,6 +25,8 @@ let self = {
     mempool-nginx-conf;
   trustedcoin = pkgs.callPackage ./trustedcoin { };
 
+  bitcoind_29 = pkgs.bitcoind;
+
   pyPkgs = import ./python-packages self pkgs.python3;
   inherit (self.pyPkgs)
     nbPython3Packages
diff --git a/test/run-tests.sh b/test/run-tests.sh
index 2c4da76..1b5420e 100755
--- a/test/run-tests.sh
+++ b/test/run-tests.sh
@@ -302,6 +302,7 @@ buildable=(
     lndPruned
     wireguard-lndconnect
     trustedcoin
+    joinmarket-bitcoind-29
 )
 buildable() { buildTests buildable "$@"; }
 
diff --git a/test/tests.nix b/test/tests.nix
index cee3b7b..53c01d4 100644
--- a/test/tests.nix
+++ b/test/tests.nix
@@ -213,7 +213,6 @@ let
       services.fulcrum.enable = true;
       services.liquidd.enable = true;
       services.btcpayserver.enable = true;
-      services.joinmarket.enable = true;
       services.joinmarket-ob-watcher.enable = true;
       services.backups.enable = true;
 
@@ -261,7 +260,6 @@ let
       services.electrs.enable = true;
       services.fulcrum.enable = true;
       services.btcpayserver.enable = true;
-      services.joinmarket.enable = true;
     };
 
     # netns and regtest, without secure-node.nix
@@ -342,6 +340,14 @@ let
         plugins.trustedcoin.enable = true;
       };
     };
+
+    # The full regtest test with bitcoind 29 and joinmarket enabled.
+    # Joinmarket only supports bitcoind 29.
+    joinmarket-bitcoind-29 = { config, ... }: {
+      imports = [ scenarios.regtest ];
+      services.joinmarket.enable = true;
+      services.bitcoind.package = config.nix-bitcoin.pkgs.bitcoind_29;
+    };
   } // (import ../dev/dev-scenarios.nix {
     inherit lib scenarios;
   });