diff --git a/boot/boot_serial/src/cbor_encode.h b/boot/boot_serial/src/cbor_encode.h
index 57b4509..4c53d45 100644
--- a/boot/boot_serial/src/cbor_encode.h
+++ b/boot/boot_serial/src/cbor_encode.h
@@ -55,10 +55,10 @@
 bool tstrx_encode(cbor_state_t *state, const cbor_string_type_t *result);
 
 #define tstrx_put(state, string) \
-	tstrx_encode(state, &(cbor_string_type_t){.value = string, len = (sizeof(string) - 1)})
+	tstrx_encode(state, &(cbor_string_type_t){.value = (const uint8_t *)string, .len = (sizeof(string) - 1)})
 
 #define tstrx_put_term(state, string) \
-	tstrx_encode(state, &(cbor_string_type_t){.value = string, len = strlen(string)})
+	tstrx_encode(state, &(cbor_string_type_t){.value = (const uint8_t *)string, .len = strlen((const char *)string)})
 
 /** Encode a LIST header.
  *
diff --git a/boot/boot_serial/src/serial_recovery_cbor.c b/boot/boot_serial/src/serial_recovery_cbor.c
index 3b4374c..2561b70 100644
--- a/boot/boot_serial/src/serial_recovery_cbor.c
+++ b/boot/boot_serial/src/serial_recovery_cbor.c
@@ -34,19 +34,19 @@
 	cbor_string_type_t tmp_str;
 	bool int_res;
 
-	bool tmp_result = (((union_start_code(state) && (int_res = (((((tstrx_expect(state, ((tmp_str.value = "image",
+	bool tmp_result = (((union_start_code(state) && (int_res = (((((tstrx_expect(state, ((tmp_str.value = (const uint8_t *)"image",
     tmp_str.len = sizeof("image") - 1, &tmp_str)))))
 	&& (intx32_decode(state, (&(*result)._Member_image)))) && (((*result)._Member_choice = _Member_image) || 1))
-	|| (union_elem_code(state) && ((((tstrx_expect(state, ((tmp_str.value = "data",
+	|| (union_elem_code(state) && ((((tstrx_expect(state, ((tmp_str.value = (const uint8_t *)"data",
     tmp_str.len = sizeof("data") - 1, &tmp_str)))))
 	&& (bstrx_decode(state, (&(*result)._Member_data)))) && (((*result)._Member_choice = _Member_data) || 1)))
-	|| (union_elem_code(state) && ((((tstrx_expect(state, ((tmp_str.value = "len",
+	|| (union_elem_code(state) && ((((tstrx_expect(state, ((tmp_str.value = (const uint8_t *)"len",
     tmp_str.len = sizeof("len") - 1, &tmp_str)))))
 	&& (intx32_decode(state, (&(*result)._Member_len)))) && (((*result)._Member_choice = _Member_len) || 1)))
-	|| (union_elem_code(state) && ((((tstrx_expect(state, ((tmp_str.value = "off",
+	|| (union_elem_code(state) && ((((tstrx_expect(state, ((tmp_str.value = (const uint8_t *)"off",
     tmp_str.len = sizeof("off") - 1, &tmp_str)))))
 	&& (intx32_decode(state, (&(*result)._Member_off)))) && (((*result)._Member_choice = _Member_off) || 1)))
-	|| (union_elem_code(state) && ((((tstrx_expect(state, ((tmp_str.value = "sha",
+	|| (union_elem_code(state) && ((((tstrx_expect(state, ((tmp_str.value = (const uint8_t *)"sha",
     tmp_str.len = sizeof("sha") - 1, &tmp_str)))))
 	&& (bstrx_decode(state, (&(*result)._Member_sha)))) && (((*result)._Member_choice = _Member_sha) || 1)))), union_end_code(state), int_res))));