diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/SqlTestDatabaseReaperTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/SqlTestDatabaseReaperTests.cs
index 92d676755..64b453b04 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/SqlTestDatabaseReaperTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/SqlTestDatabaseReaperTests.cs
@@ -103,7 +103,9 @@ public sealed class SqlTestDatabaseReaperTests
         // what bounds the character set of every candidate: without it a database named
         // "<prefix><aged timestamp>_" + arbitrary text would be fed to the drop statement, and before the
         // statement was parameterised that was a second-order injection running as sa.
-        var notAGuid = $"{AdminUiSqlServer.TestDatabasePrefix}20250101000000_notaguid";
+        // Unique per run: the SQL Server is shared by every checkout and CI, and a fixed name collided with a
+        // concurrent run's create / finally-drop. Digits only after "notaguid_", so it can never parse as a GUID.
+        var notAGuid = $"{AdminUiSqlServer.TestDatabasePrefix}20250101000000_notaguid_{Environment.ProcessId}_{Random.Shared.Next(1_000_000)}";
 
         CreateDatabase(master, notAGuid);