diff --git a/src/SharpCompress/Common/Zip/Headers/DirectoryEntryHeader.cs b/src/SharpCompress/Common/Zip/Headers/DirectoryEntryHeader.cs
index 25fb06be2..3b50d1189 100644
--- a/src/SharpCompress/Common/Zip/Headers/DirectoryEntryHeader.cs
+++ b/src/SharpCompress/Common/Zip/Headers/DirectoryEntryHeader.cs
@@ -70,8 +70,8 @@ internal override void Write(BinaryWriter writer)
             writer.Write(LastModifiedTime);
             writer.Write(LastModifiedDate);
             writer.Write(Crc);
-            writer.Write(CompressedSize);
-            writer.Write(UncompressedSize);
+            writer.Write((uint)CompressedSize);
+            writer.Write((uint)UncompressedSize);
 
             byte[] nameBytes = EncodeString(Name);
             writer.Write((ushort)nameBytes.Length);
diff --git a/src/SharpCompress/Common/Zip/Headers/LocalEntryHeader.cs b/src/SharpCompress/Common/Zip/Headers/LocalEntryHeader.cs
index 1d0720710..2e311cc86 100644
--- a/src/SharpCompress/Common/Zip/Headers/LocalEntryHeader.cs
+++ b/src/SharpCompress/Common/Zip/Headers/LocalEntryHeader.cs
@@ -55,8 +55,8 @@ internal override void Write(BinaryWriter writer)
             writer.Write(LastModifiedTime);
             writer.Write(LastModifiedDate);
             writer.Write(Crc);
-            writer.Write(CompressedSize);
-            writer.Write(UncompressedSize);
+            writer.Write((uint)CompressedSize);
+            writer.Write((uint)UncompressedSize);
 
             byte[] nameBytes = EncodeString(Name);