diff --git a/src/Configuration.KeyPerFile/test/KeyPerFileTests.cs b/src/Configuration.KeyPerFile/test/KeyPerFileTests.cs
index d55387a404..d409c0eab0 100644
--- a/src/Configuration.KeyPerFile/test/KeyPerFileTests.cs
+++ b/src/Configuration.KeyPerFile/test/KeyPerFileTests.cs
@@ -28,7 +28,7 @@ namespace Microsoft.Extensions.Configuration.KeyPerFile.Test
         public void ThrowsWhenNotOptionalAndDirectoryDoesntExist()
         {
             var e = Assert.Throws<ArgumentException>(() => new ConfigurationBuilder().AddKeyPerFile("nonexistent", false).Build());
-            Assert.Contains("The directory name", e.Message);
+            Assert.Contains("The path must be absolute.", e.Message);
         }
 
         [Fact]
@@ -305,4 +305,4 @@ namespace Microsoft.Extensions.Configuration.KeyPerFile.Test
             return new MemoryStream(Encoding.UTF8.GetBytes(_contents));
         }
     }
-}
\ No newline at end of file
+}