diff --git a/src/decoder/mod.rs b/src/decoder/mod.rs
index dd1ad32..dcda365 100644
--- a/src/decoder/mod.rs
+++ b/src/decoder/mod.rs
@@ -100,6 +100,8 @@ pub enum CompressionMethod {
     Fax4 = 4,
     LZW = 5,
     JPEG = 6,
+    Deflate = 8,
+    OldDeflate = 0x80B2,
     PackBits = 0x8005,
 }