diff --git a/src/Umbraco.PublishedCache.NuCache/DataSource/BTree.cs b/src/Umbraco.PublishedCache.NuCache/DataSource/BTree.cs
index c813e428d2..2d276fbaf4 100644
--- a/src/Umbraco.PublishedCache.NuCache/DataSource/BTree.cs
+++ b/src/Umbraco.PublishedCache.NuCache/DataSource/BTree.cs
@@ -1,7 +1,7 @@
-using System.Configuration;
 using CSharpTest.Net.Collections;
 using CSharpTest.Net.Serialization;
 using Umbraco.Cms.Core.Configuration.Models;
+using Umbraco.Cms.Core.Exceptions;
 
 namespace Umbraco.Cms.Infrastructure.PublishedCache.DataSource
 {
@@ -54,9 +54,9 @@ namespace Umbraco.Cms.Infrastructure.PublishedCache.DataSource
             for (var i = blockSize; i != 1; i >>= 1)
                 bit++;
             if (1 << bit != blockSize)
-                throw new ConfigurationErrorsException($"Invalid block size value \"{blockSize}\": must be a power of two.");
+                throw new ConfigurationException($"Invalid block size value \"{blockSize}\": must be a power of two.");
             if (blockSize < 512 || blockSize > 65536)
-                throw new ConfigurationErrorsException($"Invalid block size value \"{blockSize}\": must be >= 512 and <= 65536.");
+                throw new ConfigurationException($"Invalid block size value \"{blockSize}\": must be >= 512 and <= 65536.");
 
             return blockSize;
         }