diff --git a/test/unit/dhcp/test_dhcp.c b/test/unit/dhcp/test_dhcp.c
index 4b40de89..8addfa14 100644
--- a/test/unit/dhcp/test_dhcp.c
+++ b/test/unit/dhcp/test_dhcp.c
@@ -557,7 +557,7 @@ END_TEST
  */
 START_TEST(test_dhcp_relayed)
 {
-  const u8_t relay_offer[] = {
+  u8_t relay_offer[] = {
   0x00, 0x23, 0xc1, 0xde, 0xd0, 0x0d,
   0x00, 0x22, 0x93, 0x5a, 0xf7, 0x60,
   0x08, 0x00, 0x45, 0x00,
@@ -602,7 +602,7 @@ START_TEST(test_dhcp_relayed)
   0x04, 0x0a, 0xb5, 0x04, 0x01, 0xff
   };
 
-  const u8_t relay_ack1[] = {
+  u8_t relay_ack1[] = {
   0x00, 0x23, 0xc1, 0xde, 0xd0, 0x0d, 0x00, 0x22,
   0x93, 0x5a, 0xf7, 0x60, 0x08, 0x00, 0x45, 0x00,
   0x01, 0x38, 0xfd, 0x55, 0x00, 0x00, 0x40, 0x11,
@@ -646,7 +646,7 @@ START_TEST(test_dhcp_relayed)
   0x04, 0x0a, 0xb5, 0x04, 0x01, 0xff
   };
 
-  const u8_t relay_ack2[] = {
+  u8_t relay_ack2[] = {
   0x00, 0x23, 0xc1, 0xde, 0xd0, 0x0d,
   0x00, 0x22, 0x93, 0x5a, 0xf7, 0x60,
   0x08, 0x00, 0x45, 0x00,