diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Ab.Transport.Tests/LibplctagConfinementGuardTests.cs b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Ab.Transport.Tests/LibplctagConfinementGuardTests.cs
index dae8c0b0..1ee25c6d 100644
--- a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Ab.Transport.Tests/LibplctagConfinementGuardTests.cs
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Ab.Transport.Tests/LibplctagConfinementGuardTests.cs
@@ -7,7 +7,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Ab.Transport.Tests;
 public sealed class LibplctagConfinementGuardTests
 {
     private static readonly Regex Reference = new(
-        @"\busing\s+libplctag\b|\blibplctag\.(Tag|Status|PlcType|Protocol|LibPlcTagException|NativeImport)\b",
+        @"\busing\s+(static\s+)?(\w+\s*=\s*)?libplctag\b|\blibplctag\.[A-Z]",
         RegexOptions.Compiled);
 
     [Fact]
@@ -43,4 +43,15 @@ public sealed class LibplctagConfinementGuardTests
         var prose = "via libplctag. Second of six driver CLIs";
         Reference.IsMatch(prose).ShouldBeFalse();
     }
+
+    [Theory]
+    [InlineData("using libplctag;")]
+    [InlineData("global using libplctag;")]
+    [InlineData("using static libplctag.NativeImport.plctag;")]
+    [InlineData("using T = libplctag.Tag;")]
+    [InlineData("var x = new libplctag.DataTypes.DintPlcMapper();")]
+    public void Code_references_trip_the_guard(string code)
+    {
+        Reference.IsMatch(code).ShouldBeTrue($"regex should match: {code}");
+    }
 }