diff --git a/doc/file-format.txt b/doc/file-format.txt
index 951e3943..60ec6b72 100644
--- a/doc/file-format.txt
+++ b/doc/file-format.txt
@@ -86,7 +86,7 @@ The .lzma File Format
 
 0.2. Changes
 
-        Last modified: 2008-09-03 14:10+0300
+        Last modified: 2008-09-07 10:20+0300
 
         (A changelog will be kept once the first official version
         is made.)
@@ -777,7 +777,7 @@ The .lzma File Format
         decompression. LZMA is based on LZ77 and range coding
         algorithms.
 
-            Filter ID:                  0x40
+            Filter ID:                  0x20
             Size of Filter Properties:  5 bytes
             Changes size of data:       Yes
             Allow as a non-last filter: No
diff --git a/src/liblzma/api/lzma/lzma.h b/src/liblzma/api/lzma/lzma.h
index 5a1cd912..64d47393 100644
--- a/src/liblzma/api/lzma/lzma.h
+++ b/src/liblzma/api/lzma/lzma.h
@@ -26,7 +26,7 @@
  *
  * Filter ID of the LZMA filter. This is used as lzma_filter.id.
  */
-#define LZMA_FILTER_LZMA        LZMA_VLI_C(0x40)
+#define LZMA_FILTER_LZMA        LZMA_VLI_C(0x20)
 
 #define LZMA_FILTER_LZMA2       LZMA_VLI_C(0x21)