diff --git a/libs/libc/misc/lib_crc16.c b/libs/libc/misc/lib_crc16.c
index 171b9a17cdb..562ea3e97ed 100644
--- a/libs/libc/misc/lib_crc16.c
+++ b/libs/libc/misc/lib_crc16.c
@@ -49,7 +49,7 @@
 
 /* crc16_tab calculated by Mark G. Mendel, Network Systems Corporation */
 
-static uint16_t crc16_tab[256] =
+static const uint16_t crc16_tab[256] =
 {
   0x0000,  0x1021,  0x2042,  0x3063,  0x4084,  0x50a5,  0x60c6,  0x70e7,
   0x8108,  0x9129,  0xa14a,  0xb16b,  0xc18c,  0xd1ad,  0xe1ce,  0xf1ef,
diff --git a/libs/libc/misc/lib_crc16ccitt.c b/libs/libc/misc/lib_crc16ccitt.c
index 21a574088b8..e94ff969276 100644
--- a/libs/libc/misc/lib_crc16ccitt.c
+++ b/libs/libc/misc/lib_crc16ccitt.c
@@ -35,7 +35,7 @@
 
 /* From CRC-16-CCITT (x^16+x^12+x^5+1) */
 
-static uint16_t crc16ccitt_tab[256] =
+static const uint16_t crc16ccitt_tab[256] =
 {
   0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
   0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,