diff --git a/src/crc32.rs b/src/crc32.rs
index ec3d2638..5e8a341e 100644
--- a/src/crc32.rs
+++ b/src/crc32.rs
@@ -3,7 +3,7 @@
 use std::io;
 use std::io::prelude::*;
 
-static CRC32_TABLE : [u32; 256] = [
+const CRC32_TABLE : [u32; 256] = [
 	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
 	0xe963a535, 0x9e6495a3,	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
 	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
diff --git a/src/spec.rs b/src/spec.rs
index ff3cbcde..f70a3175 100644
--- a/src/spec.rs
+++ b/src/spec.rs
@@ -3,9 +3,9 @@ use std::io::prelude::*;
 use result::{ZipResult, ZipError};
 use podio::{ReadPodExt, WritePodExt, LittleEndian};
 
-pub static LOCAL_FILE_HEADER_SIGNATURE : u32 = 0x04034b50;
-pub static CENTRAL_DIRECTORY_HEADER_SIGNATURE : u32 = 0x02014b50;
-static CENTRAL_DIRECTORY_END_SIGNATURE : u32 = 0x06054b50;
+pub const LOCAL_FILE_HEADER_SIGNATURE : u32 = 0x04034b50;
+pub const CENTRAL_DIRECTORY_HEADER_SIGNATURE : u32 = 0x02014b50;
+const CENTRAL_DIRECTORY_END_SIGNATURE : u32 = 0x06054b50;
 
 pub struct CentralDirectoryEnd
 {
diff --git a/src/write.rs b/src/write.rs
index b4dc080b..b38ccd37 100644
--- a/src/write.rs
+++ b/src/write.rs
@@ -434,7 +434,7 @@ fn write_local_file_header<T: Write>(writer: &mut T, file: &ZipFileData) -> ZipR
 
 fn update_local_file_header<T: Write+io::Seek>(writer: &mut T, file: &ZipFileData) -> ZipResult<()>
 {
-    static CRC32_OFFSET : u64 = 14;
+    const CRC32_OFFSET : u64 = 14;
     try!(writer.seek(io::SeekFrom::Start(file.header_start + CRC32_OFFSET)));
     try!(writer.write_u32::<LittleEndian>(file.crc32));
     try!(writer.write_u32::<LittleEndian>(file.compressed_size as u32));