diff --git a/src/Umbraco.Tests.Integration/AssemblyAttributes.cs b/src/Umbraco.Tests.Integration/AssemblyAttributes.cs
new file mode 100644
index 0000000000..afa3bb903e
--- /dev/null
+++ b/src/Umbraco.Tests.Integration/AssemblyAttributes.cs
@@ -0,0 +1,4 @@
+using NUnit.Framework;
+
+[assembly: SetCulture("en-US")]
+[assembly: SetUICulture("en-US")]
diff --git a/src/Umbraco.Tests.UnitTests/AssemblyAttributes.cs b/src/Umbraco.Tests.UnitTests/AssemblyAttributes.cs
new file mode 100644
index 0000000000..afa3bb903e
--- /dev/null
+++ b/src/Umbraco.Tests.UnitTests/AssemblyAttributes.cs
@@ -0,0 +1,4 @@
+using NUnit.Framework;
+
+[assembly: SetCulture("en-US")]
+[assembly: SetUICulture("en-US")]