diff --git a/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs b/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs
index 7612d2c755..e4c8d49ba8 100644
--- a/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs
+++ b/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs
@@ -184,13 +184,15 @@ public void GetSwagger_GenerateParametersSchemas_IfActionParameterIsIllegalHeade
                             {
                                 Name = illegalParameterName,
                                 Source = BindingSource.Header,
-                                ModelMetadata = ModelMetadataFactory.CreateForParameter(illegalParameter)
+                                ModelMetadata = ModelMetadataFactory.CreateForParameter(illegalParameter),
+                                Type = typeof(string)
                             },
                             new ApiParameterDescription
                             {
                                 Name = "param",
                                 Source = BindingSource.Header,
-                                ModelMetadata = ModelMetadataFactory.CreateForType(typeof(string))
+                                ModelMetadata = ModelMetadataFactory.CreateForType(typeof(string)),
+                                Type = typeof(string)
                             }
                         }),
                 }