diff --git a/Consumer/TestCaseData.fs b/Consumer/TestCaseData.fs
index a9f6738..cda3237 100644
--- a/Consumer/TestCaseData.fs
+++ b/Consumer/TestCaseData.fs
@@ -35,6 +35,13 @@ module TestCaseData =
     [<TestCaseSource(nameof optionalRaw)>]
     let ``Consume options, raw`` (s : string option) : unit = s |> shouldEqual s
 
+    [<TestCase(30, 15, 44, false)>]
+    let bug66 (i : int, j : int, k : int, l : bool) =
+        i |> shouldEqual 30
+        j |> shouldEqual 15
+        k |> shouldEqual 44
+        l |> shouldEqual false
+
     [<OneTimeTearDown>]
     let tearDown () =
         testCasesSeen
diff --git a/WoofWare.NUnitTestRunner.Lib/SingleTestMethod.fs b/WoofWare.NUnitTestRunner.Lib/SingleTestMethod.fs
index ee4bd3d..d1e459b 100644
--- a/WoofWare.NUnitTestRunner.Lib/SingleTestMethod.fs
+++ b/WoofWare.NUnitTestRunner.Lib/SingleTestMethod.fs
@@ -30,6 +30,15 @@ module SingleTestMethod =
                 | "NUnit.Framework.TestCaseAttribute" ->
                     let args = attr.ConstructorArguments |> Seq.map _.Value |> Seq.toList
 
+                    let args =
+                        match args with
+                        | [ :? System.Collections.ICollection as x ] ->
+                            x
+                            |> Seq.cast<CustomAttributeTypedArgument>
+                            |> Seq.map (fun v -> v.Value)
+                            |> Seq.toList
+                        | _ -> args
+
                     match hasData with
                     | None -> (remaining, isTest, sources, Some [ List.ofSeq args ], mods, cats, repeat, comb)
                     | Some existing ->