diff --git a/HISTORY b/HISTORY
index b745b96..4af2eed 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,9 +1,10 @@
 
-Version 5.12  2018-05-23
+Version 5.12  2018-06-07
  * code refine for rare case
  * replace print format OFF_PRINTF_FORMAT to PRId64
  * php_ext fix zend_object_store_get_object call in php5.5
  * make.sh uses macros define in /usr/include/fastcommon/_os_define.h
+ * correct CRC32, you must upgrade libfastcommon to V1.38 or later
 
 Version 5.11  2017-05-26
  * bug fixed: file_offset has no effect when use trunk file
diff --git a/client/fdfs_crc32.c b/client/fdfs_crc32.c
index b460197..f8d7522 100644
--- a/client/fdfs_crc32.c
+++ b/client/fdfs_crc32.c
@@ -24,7 +24,7 @@ int main(int argc, char *argv[])
 	int fd;
 	int read_bytes;
 	int result;
-	int crc32;
+	int64_t crc32;
 	char buff[512 * 1024];
 
 	if (argc < 2)
@@ -97,7 +97,7 @@ int main(int argc, char *argv[])
 	if (result == 0)
 	{
 		crc32 = CRC32_FINAL(crc32);
-		printf("%u\n", crc32);
+		printf("%x\n", (int)crc32);
 	}
 
 	return result;
diff --git a/storage/storage_nio.h b/storage/storage_nio.h
index 7a14458..632362c 100644
--- a/storage/storage_nio.h
+++ b/storage/storage_nio.h
@@ -91,7 +91,7 @@ typedef struct
 	bool calc_file_hash;      //if calculate file content hash code
 	int open_flags;           //open file flags
 	int file_hash_codes[4];   //file hash code
-	int crc32;   //file content crc32 signature
+	int64_t crc32;            //file content crc32 signature
 	MD5_CTX md5_context;
 
 	union