diff --git a/erasure_code/ec_base.h b/erasure_code/ec_base.h
index d69a92d..070b276 100644
--- a/erasure_code/ec_base.h
+++ b/erasure_code/ec_base.h
@@ -32,7 +32,7 @@
 
 // Global GF(256) tables
 #ifndef GF_LARGE_TABLES
-unsigned char gff_base[] = {
+static const unsigned char gff_base[] = {
 	0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1d, 0x3a,
 	0x74, 0xe8, 0xcd, 0x87, 0x13, 0x26, 0x4c, 0x98, 0x2d, 0x5a,
 	0xb4, 0x75, 0xea, 0xc9, 0x8f, 0x03, 0x06, 0x0c, 0x18, 0x30,
@@ -61,7 +61,7 @@ unsigned char gff_base[] = {
 	0x6c, 0xd8, 0xad, 0x47, 0x8e, 0x01
 };
 
-unsigned char gflog_base[] = {
+static const unsigned char gflog_base[] = {
 	0x00, 0xff, 0x01, 0x19, 0x02, 0x32, 0x1a, 0xc6, 0x03, 0xdf,
 	0x33, 0xee, 0x1b, 0x68, 0xc7, 0x4b, 0x04, 0x64, 0xe0, 0x0e,
 	0x34, 0x8d, 0xef, 0x81, 0x1c, 0xc1, 0x69, 0xf8, 0xc8, 0x08,
@@ -90,7 +90,7 @@ unsigned char gflog_base[] = {
 	0xf4, 0xea, 0xa8, 0x50, 0x58, 0xaf
 };
 #else
-unsigned char gf_mul_table_base[] = {
+static const unsigned char gf_mul_table_base[] = {
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -6647,7 +6647,7 @@ unsigned char gf_mul_table_base[] = {
 	0xc6, 0x39, 0xfe, 0x01, 0x1d, 0xe2
 };
 
-unsigned char gf_inv_table_base[] = {
+static const unsigned char gf_inv_table_base[] = {
 	0x00, 0x01, 0x8e, 0xf4, 0x47, 0xa7, 0x7a, 0xba, 0xad, 0x9d,
 	0xdd, 0x98, 0x3d, 0xaa, 0x5d, 0x96, 0xd8, 0x72, 0xc0, 0x58,
 	0xe0, 0x3e, 0x4c, 0x66, 0x90, 0xde, 0x55, 0x80, 0xa0, 0x83,