diff --git a/src/MockQueryable/MockQueryable.FakeItEasy/FakeItEasyExtensions.cs b/src/MockQueryable/MockQueryable.FakeItEasy/FakeItEasyExtensions.cs
index 17e9558..5e418fb 100644
--- a/src/MockQueryable/MockQueryable.FakeItEasy/FakeItEasyExtensions.cs
+++ b/src/MockQueryable/MockQueryable.FakeItEasy/FakeItEasyExtensions.cs
@@ -10,7 +10,7 @@ namespace MockQueryable.FakeItEasy
 {
     public static class FakeItEasyExtensions
     {
-        public static IQueryable<TEntity> BuildMock<TEntity>(this IEnumerable<TEntity> data) where TEntity : class
+        public static IQueryable<TEntity> BuildMock<TEntity>(this IEnumerable<TEntity> data)
         {
             return new TestAsyncEnumerableEfCore<TEntity>(data);
         }
diff --git a/src/MockQueryable/MockQueryable.Moq/MoqExtensions.cs b/src/MockQueryable/MockQueryable.Moq/MoqExtensions.cs
index a877d11..48581fe 100644
--- a/src/MockQueryable/MockQueryable.Moq/MoqExtensions.cs
+++ b/src/MockQueryable/MockQueryable.Moq/MoqExtensions.cs
@@ -10,7 +10,7 @@ namespace MockQueryable.Moq
 {
 	public static class MoqExtensions
 	{
-		public static IQueryable<TEntity> BuildMock<TEntity>(this IEnumerable<TEntity> data) where TEntity : class
+		public static IQueryable<TEntity> BuildMock<TEntity>(this IEnumerable<TEntity> data)
 		{
             return new TestAsyncEnumerableEfCore<TEntity>(data);
 		}
diff --git a/src/MockQueryable/MockQueryable.NSubstitute/NSubstituteExtensions.cs b/src/MockQueryable/MockQueryable.NSubstitute/NSubstituteExtensions.cs
index 810b845..19108cc 100644
--- a/src/MockQueryable/MockQueryable.NSubstitute/NSubstituteExtensions.cs
+++ b/src/MockQueryable/MockQueryable.NSubstitute/NSubstituteExtensions.cs
@@ -10,7 +10,7 @@ namespace MockQueryable.NSubstitute
 {
   public static class NSubstituteExtensions
   {
-    public static IQueryable<TEntity> BuildMock<TEntity>(this IEnumerable<TEntity> data) where TEntity : class
+    public static IQueryable<TEntity> BuildMock<TEntity>(this IEnumerable<TEntity> data)
     {
         return new TestAsyncEnumerableEfCore<TEntity>(data);
     }