diff --git a/ChangeLog b/ChangeLog
index a51be7ab17..33ff1132f7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Jan 14 13:38:58 2011  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* ext/zlib/zlib.c (gzfile_check_footer): ISIZE (Input SIZE) in
+	  gzip's header is the size of uncompressed input data modulo 2^32.
+	  [ruby-core:34481] http://www.ietf.org/rfc/rfc1952.txt
+
 Fri Jan 14 07:30:47 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* io.c (argf_next_argv): go advance when the next file cannot be
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index 452f91acf2..c52ebf3020 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -2106,7 +2106,7 @@ gzfile_check_footer(struct gzfile *gz)
     if (gz->crc != crc) {
 	rb_raise(cCRCError, "invalid compressed data -- crc error");
     }
-    if (gz->z.stream.total_out != length) {
+    if ((uint32_t)gz->z.stream.total_out != length) {
 	rb_raise(cLengthError, "invalid compressed data -- length error");
     }
 }
diff --git a/version.h b/version.h
index 5a62b244d0..babb1b7528 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.2"
-#define RUBY_PATCHLEVEL 155
+#define RUBY_PATCHLEVEL 156
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 1