diff --git a/src/vendorcode/siemens/hwilib/hwilib.c b/src/vendorcode/siemens/hwilib/hwilib.c
index b6c8c6badf..2a3c10aec6 100644
--- a/src/vendorcode/siemens/hwilib/hwilib.c
+++ b/src/vendorcode/siemens/hwilib/hwilib.c
@@ -53,7 +53,7 @@ struct param_info {
 	struct param_pos pos[MAX_BLOCK_NUM];
 	uint64_t mask;
 	uint8_t mask_offset;
-	uint32_t (*get_field)(const struct param_info *param, uint8_t *dst, size_t dstsize);
+	size_t (*get_field)(const struct param_info *param, uint8_t *dst, size_t dstsize);
 };
 
 /* Storage for pointers to the different blocks. The contents will be filled
@@ -69,7 +69,7 @@ static uint16_t all_blk_size[MAX_BLOCK_NUM];
 /* Storage for the cbfs file name of the currently open hwi file. */
 static char current_hwi[HWI_MAX_NAME_LEN];
 
-static uint32_t hwilib_read_bytes(const struct param_info *param, uint8_t *dst, size_t dstsize);
+static size_t hwilib_read_bytes(const struct param_info *param, uint8_t *dst, size_t dstsize);
 
 /* Add all supported fields to this variable. It is important to use the
  * field type of a given field as the array index so that all the information
@@ -385,7 +385,7 @@ static const struct param_info params[] = {
  * @param  dstsize	Size of the memory passed in via the *dst pointer
  * @return		Number of copied bytes on success, 0 on error
  */
-static uint32_t hwilib_read_bytes(const struct param_info *param, uint8_t *dst, size_t dstsize)
+static size_t hwilib_read_bytes(const struct param_info *param, uint8_t *dst, size_t dstsize)
 {
 	uint8_t i = 0, *blk = NULL;
 
@@ -541,7 +541,7 @@ enum cb_err hwilib_find_blocks(const char *hwi_filename)
  * @param  dstsize	Size of the memory passed in via the *dst pointer
  * @return		Number of copied bytes on success, 0 on error
  */
-uint32_t hwilib_get_field(hwinfo_field_t field, uint8_t *dst, size_t dstsize)
+size_t hwilib_get_field(hwinfo_field_t field, uint8_t *dst, size_t dstsize)
 {
 	/* Check the boundaries of params-variable */
 	if ((uint32_t)field < ARRAY_SIZE(params))
diff --git a/src/vendorcode/siemens/hwilib/hwilib.h b/src/vendorcode/siemens/hwilib/hwilib.h
index e4b11dd528..2a4f4cd610 100644
--- a/src/vendorcode/siemens/hwilib/hwilib.h
+++ b/src/vendorcode/siemens/hwilib/hwilib.h
@@ -123,6 +123,6 @@ enum cb_err hwilib_find_blocks(const char *hwi_filename);
 /* Use this function to get fields out of supported info blocks
  * This function returns the number of copied bytes or 0 on error.
  */
-uint32_t hwilib_get_field(hwinfo_field_t field, uint8_t *dst, size_t dstsize);
+size_t hwilib_get_field(hwinfo_field_t field, uint8_t *dst, size_t dstsize);
 
 #endif /* SIEMENS_HWI_LIB_H_ */