diff --git a/tests/FsUnit.MsTest.Test/beSubsetOfTests.fs b/tests/FsUnit.MsTest.Test/beSubsetOfTests.fs
index 28d6df53..b257ab11 100644
--- a/tests/FsUnit.MsTest.Test/beSubsetOfTests.fs
+++ b/tests/FsUnit.MsTest.Test/beSubsetOfTests.fs
@@ -34,6 +34,6 @@ type ``be subsetOf tests`` ()=
         [1..10] |> should be (subsetOf [1..10])
 
     [<TestMethod>] member test.
-     ``should fail on '1 to 10 should not be subset of 1 to 10'`` ()=
+     ``should fail on '1 to 11 should be subset of 1 to 10'`` ()=
         shouldFail (fun () -> 
-            [1..10] |> should not' (be subsetOf [1..10]))
+            [1..11] |> should be (subsetOf [1..10]))
diff --git a/tests/FsUnit.MsTest.Test/beSupersetOfTests.fs b/tests/FsUnit.MsTest.Test/beSupersetOfTests.fs
index 9b0c061f..4c1f2dd2 100644
--- a/tests/FsUnit.MsTest.Test/beSupersetOfTests.fs
+++ b/tests/FsUnit.MsTest.Test/beSupersetOfTests.fs
@@ -34,6 +34,6 @@ type ``be supersetOf tests`` ()=
         [1..10] |> should be (supersetOf [1..10])
 
     [<TestMethod>] member test.
-     ``should fail on '1 to 10 should not be superset of 1 to 10'`` ()=
+     ``should fail on '1 to 10 should be superset of 1 to 11'`` ()=
         shouldFail (fun () -> 
-            [1..10] |> should not' (be supersetOf [1..10]))
+            [1..10] |> should be (supersetOf [1..11]))
diff --git a/tests/FsUnit.NUnit.Test/beSubsetOfTests.fs b/tests/FsUnit.NUnit.Test/beSubsetOfTests.fs
index 98bbecdd..bd5754c7 100644
--- a/tests/FsUnit.NUnit.Test/beSubsetOfTests.fs
+++ b/tests/FsUnit.NUnit.Test/beSubsetOfTests.fs
@@ -34,6 +34,6 @@ type ``be subsetOf tests`` ()=
         [1..10] |> should be (subsetOf [1..10])
 
     [<Test>] member test.
-     ``should fail on '1 to 10 should not be subset of 1 to 10'`` ()=
+     ``should fail on '1 to 11 should be subset of 1 to 10'`` ()=
         shouldFail (fun () -> 
-            [1..10] |> should not' (be subsetOf [1..10]))
\ No newline at end of file
+            [1..11] |> should be (subsetOf [1..10]))
\ No newline at end of file
diff --git a/tests/FsUnit.NUnit.Test/beSupersetOfTests.fs b/tests/FsUnit.NUnit.Test/beSupersetOfTests.fs
index d9197ae7..58f9b2d5 100644
--- a/tests/FsUnit.NUnit.Test/beSupersetOfTests.fs
+++ b/tests/FsUnit.NUnit.Test/beSupersetOfTests.fs
@@ -34,6 +34,6 @@ type ``be supersetOf tests`` ()=
         [1..10] |> should be (supersetOf [1..10])
 
     [<Test>] member test.
-     ``should fail on '1 to 10 should not be superset of 1 to 10'`` ()=
+     ``should fail on '1 to 10 should be superset of 1 to 11'`` ()=
         shouldFail (fun () -> 
-            [1..10] |> should not' (be supersetOf [1..10]))
+            [1..10] |> should be (supersetOf [1..11]))
diff --git a/tests/FsUnit.Xunit.Test/beSubsetOfTests.fs b/tests/FsUnit.Xunit.Test/beSubsetOfTests.fs
index ea30fb84..4ab6a7e2 100644
--- a/tests/FsUnit.Xunit.Test/beSubsetOfTests.fs
+++ b/tests/FsUnit.Xunit.Test/beSubsetOfTests.fs
@@ -33,6 +33,6 @@ type ``be subsetOf tests`` ()=
         [1..10] |> should be (subsetOf [1..10])
 
     [<Fact>] member test.
-     ``should fail on '1 to 10 should not be subset of 1 to 10'`` ()=
+     ``should fail on '1 to 11 should be subset of 1 to 10'`` ()=
         shouldFail (fun () -> 
-            [1..10] |> should not' (be subsetOf [1..10]))
+            [1..11] |> should be (subsetOf [1..10]))
diff --git a/tests/FsUnit.Xunit.Test/beSupersetOfTests.fs b/tests/FsUnit.Xunit.Test/beSupersetOfTests.fs
index 30ced35b..0d37b859 100644
--- a/tests/FsUnit.Xunit.Test/beSupersetOfTests.fs
+++ b/tests/FsUnit.Xunit.Test/beSupersetOfTests.fs
@@ -33,6 +33,6 @@ type ``be supersetOf tests`` ()=
         [1..10] |> should be (supersetOf [1..10])
 
     [<Fact>] member test.
-     ``should fail on '1 to 10 should not be superset of 1 to 10'`` ()=
+     ``should fail on '1 to 10 should be superset of 1 to 11'`` ()=
         shouldFail (fun () -> 
-            [1..10] |> should not' (be supersetOf [1..10]))
+            [1..10] |> should be (supersetOf [1..11]))