diff --git a/src/Humanizer.Tests/ApiApprover/PublicApiApprovalTest.Approve_Public_Api.DotNet8_0.verified.txt b/src/Humanizer.Tests/ApiApprover/PublicApiApprovalTest.Approve_Public_Api.DotNet8_0.verified.txt
index 322c2ee61..951710cac 100644
--- a/src/Humanizer.Tests/ApiApprover/PublicApiApprovalTest.Approve_Public_Api.DotNet8_0.verified.txt
+++ b/src/Humanizer.Tests/ApiApprover/PublicApiApprovalTest.Approve_Public_Api.DotNet8_0.verified.txt
@@ -1,4 +1,5 @@
 [assembly: System.Resources.NeutralResourcesLanguage("en")]
+[assembly: System.Runtime.CompilerServices.InternalsVisibleTo(@"Humanizer.Tests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100F9104F5F9BDB168AE140366EB1CD84C469B020EA3423D5D29996D5214CE2BD9B7C0BA3EAD1CA545C4399668AB8911E61CC1CC83C7DF6D50FD6B781365B467E65173F40A11C957D27C5AA0CB0F8DA9C91C988203CC8AEF1468C74A472839D0FD870DA8D13A4DC6B3AAFDAF0384D8E18E393C613D88BF02A64467A119902204FCC")]
 [assembly: System.Runtime.Versioning.TargetFramework(".NETCoreApp,Version=v6.0", FrameworkDisplayName=".NET 6.0")]
 namespace Humanizer
 {
diff --git a/src/Humanizer.Tests/ApiApprover/PublicApiApprovalTest.Approve_Public_Api.Net4_8.verified.txt b/src/Humanizer.Tests/ApiApprover/PublicApiApprovalTest.Approve_Public_Api.Net4_8.verified.txt
index 4be649f42..5374bb507 100644
--- a/src/Humanizer.Tests/ApiApprover/PublicApiApprovalTest.Approve_Public_Api.Net4_8.verified.txt
+++ b/src/Humanizer.Tests/ApiApprover/PublicApiApprovalTest.Approve_Public_Api.Net4_8.verified.txt
@@ -1,4 +1,5 @@
 [assembly: System.Resources.NeutralResourcesLanguage("en")]
+[assembly: System.Runtime.CompilerServices.InternalsVisibleTo(@"Humanizer.Tests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100F9104F5F9BDB168AE140366EB1CD84C469B020EA3423D5D29996D5214CE2BD9B7C0BA3EAD1CA545C4399668AB8911E61CC1CC83C7DF6D50FD6B781365B467E65173F40A11C957D27C5AA0CB0F8DA9C91C988203CC8AEF1468C74A472839D0FD870DA8D13A4DC6B3AAFDAF0384D8E18E393C613D88BF02A64467A119902204FCC")]
 [assembly: System.Runtime.Versioning.TargetFramework(".NETStandard,Version=v2.0", FrameworkDisplayName=".NET Standard 2.0")]
 namespace Humanizer
 {
diff --git a/src/Humanizer/InternalsVisibleTo.cs b/src/Humanizer/InternalsVisibleTo.cs
new file mode 100644
index 000000000..040155144
--- /dev/null
+++ b/src/Humanizer/InternalsVisibleTo.cs
@@ -0,0 +1,3 @@
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("Humanizer.Tests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100F9104F5F9BDB168AE140366EB1CD84C469B020EA3423D5D29996D5214CE2BD9B7C0BA3EAD1CA545C4399668AB8911E61CC1CC83C7DF6D50FD6B781365B467E65173F40A11C957D27C5AA0CB0F8DA9C91C988203CC8AEF1468C74A472839D0FD870DA8D13A4DC6B3AAFDAF0384D8E18E393C613D88BF02A64467A119902204FCC")]