diff --git a/src/libraries/System.IO.Packaging/src/System/IO/Packaging/ZipPackage.cs b/src/libraries/System.IO.Packaging/src/System/IO/Packaging/ZipPackage.cs
index d5ae72393f44f..d604e8a766c4b 100644
--- a/src/libraries/System.IO.Packaging/src/System/IO/Packaging/ZipPackage.cs
+++ b/src/libraries/System.IO.Packaging/src/System/IO/Packaging/ZipPackage.cs
@@ -258,7 +258,7 @@ internal ZipPackage(string path, FileMode packageFileMode, FileAccess packageFil
                 else if (packageFileAccess == FileAccess.ReadWrite)
                     zipArchiveMode = ZipArchiveMode.Update;
 
-                zipArchive = new ZipArchive(_containerStream, zipArchiveMode, true, Text.Encoding.UTF8);
+                zipArchive = new ZipArchive(_containerStream, zipArchiveMode, true);
                 _zipStreamManager = new ZipStreamManager(zipArchive, _packageFileMode, _packageFileAccess);
                 contentTypeHelper = new ContentTypeHelper(zipArchive, _packageFileMode, _packageFileAccess, _zipStreamManager);
             }
@@ -325,7 +325,7 @@ internal ZipPackage(Stream s, FileMode packageFileMode, FileAccess packageFileAc
                 else if (packageFileAccess == FileAccess.ReadWrite)
                     zipArchiveMode = ZipArchiveMode.Update;
 
-                zipArchive = new ZipArchive(s, zipArchiveMode, true, Text.Encoding.UTF8);
+                zipArchive = new ZipArchive(s, zipArchiveMode, true);
 
                 _zipStreamManager = new ZipStreamManager(zipArchive, packageFileMode, packageFileAccess);
                 contentTypeHelper = new ContentTypeHelper(zipArchive, packageFileMode, packageFileAccess, _zipStreamManager);