diff --git a/src/cx_wrappers.c b/src/cx_wrappers.c
index 579846f66..db26f2621 100644
--- a/src/cx_wrappers.c
+++ b/src/cx_wrappers.c
@@ -63,7 +63,7 @@ cx_err_t cx_ecdsa_sign_rs_no_throw(const cx_ecfp_private_key_t *key,
 
 #define CX_CRC32_INIT 0xFFFFFFFF
 
-static unsigned int cx_ccitt32[] = {
+static const unsigned int cx_ccitt32[] = {
     0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
     0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
     0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,