diff --git a/test/Microsoft.AspNetCore.Mvc.Core.Test/ConsumesAttributeTests.cs b/test/Microsoft.AspNetCore.Mvc.Core.Test/ConsumesAttributeTests.cs
index 9170244e1d..7012564de5 100644
--- a/test/Microsoft.AspNetCore.Mvc.Core.Test/ConsumesAttributeTests.cs
+++ b/test/Microsoft.AspNetCore.Mvc.Core.Test/ConsumesAttributeTests.cs
@@ -25,7 +25,7 @@ namespace Microsoft.AspNetCore.Mvc
         public void Constructor_ForInvalidContentType_Throws(string contentType)
         {
             // Arrange
-            var expectedMessage = string.Format("Invalid value '{0}'.", contentType);
+            var expectedMessage = string.Format("The header contains invalid values at index 0: '{0}'", contentType);
 
             // Act & Assert
             var exception = Assert.Throws<FormatException>(() => new ConsumesAttribute(contentType));
@@ -47,7 +47,7 @@ namespace Microsoft.AspNetCore.Mvc
             // Assert
             var ex = Assert.Throws<FormatException>(
                        () => new ConsumesAttribute(contentTypes[0], contentTypes.Skip(1).ToArray()));
-            Assert.Equal("Invalid value '" + (invalidContentType ?? "<null>") + "'.",
+            Assert.Equal("The header contains invalid values at index 0: '" + (invalidContentType ?? "<null>") + "'",
                          ex.Message);
         }
 
diff --git a/test/Microsoft.AspNetCore.Mvc.Core.Test/ProducesAttributeTests.cs b/test/Microsoft.AspNetCore.Mvc.Core.Test/ProducesAttributeTests.cs
index 973292f454..c8bac3ffd7 100644
--- a/test/Microsoft.AspNetCore.Mvc.Core.Test/ProducesAttributeTests.cs
+++ b/test/Microsoft.AspNetCore.Mvc.Core.Test/ProducesAttributeTests.cs
@@ -106,7 +106,8 @@ namespace Microsoft.AspNetCore.Mvc.Test
             // Assert
             var ex = Assert.Throws<FormatException>(
                        () => new ProducesAttribute(contentTypes[0], contentTypes.Skip(1).ToArray()));
-            Assert.Equal("Invalid value '" + (invalidContentType ?? "<null>") + "'.", ex.Message);
+            Assert.Equal("The header contains invalid values at index 0: '" + (invalidContentType ?? "<null>") + "'",
+                         ex.Message);
         }
 
         [Theory]