diff --git a/nixos/tests/harmonia.nix b/nixos/tests/harmonia.nix
index f847ed771450..d648cd2b00f0 100644
--- a/nixos/tests/harmonia.nix
+++ b/nixos/tests/harmonia.nix
@@ -35,7 +35,7 @@
     ''
       start_all()
 
-      harmonia.wait_for_unit("harmonia.service")
+      harmonia.wait_for_unit("harmonia.socket")
 
       client01.wait_until_succeeds("curl -f http://harmonia:5000/nix-cache-info | grep '${toString nodes.harmonia.services.harmonia.cache.settings.priority}' >&2")
       client01.succeed("curl -f http://harmonia:5000/version | grep '${nodes.harmonia.services.harmonia.package.version}' >&2")
diff --git a/nixos/tests/ncps-ha-pg-redis.nix b/nixos/tests/ncps-ha-pg-redis.nix
index 9d65f4de720c..80b8925b38e9 100644
--- a/nixos/tests/ncps-ha-pg-redis.nix
+++ b/nixos/tests/ncps-ha-pg-redis.nix
@@ -180,7 +180,7 @@ in
 
       start_all()
 
-      harmonia.wait_for_unit("harmonia.service")
+      harmonia.wait_for_unit("harmonia.socket")
 
       ncps0.wait_for_unit("ncps.service")
       ncps1.wait_for_unit("ncps.service")
diff --git a/nixos/tests/ncps.nix b/nixos/tests/ncps.nix
index ecda50d5f92d..87b1c33424b8 100644
--- a/nixos/tests/ncps.nix
+++ b/nixos/tests/ncps.nix
@@ -66,7 +66,7 @@
     ''
       start_all()
 
-      harmonia.wait_for_unit("harmonia.service")
+      harmonia.wait_for_unit("harmonia.socket")
 
       ncps.wait_for_unit("ncps.service")