diff --git a/common/spl/spl_spi.c b/common/spl/spl_spi.c
index ddc33fd..8cd4830 100644
--- a/common/spl/spl_spi.c
+++ b/common/spl/spl_spi.c
@@ -28,7 +28,7 @@
 	int err;
 
 	/* Read for a header, parse or error out. */
-	spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
+	spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, sizeof(*header),
 		       (void *)header);
 
 	if (image_get_magic(header) != IH_MAGIC)
@@ -88,7 +88,7 @@
 		return -ENODEV;
 	}
 
-	header = spl_get_load_buffer(-sizeof(*header), 0x40);
+	header = spl_get_load_buffer(-sizeof(*header), sizeof(*header));
 
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 	payload_offs = fdtdec_get_config_int(gd->fdt_blob,
@@ -101,7 +101,7 @@
 #endif
 	{
 		/* Load u-boot, mkimage header is 64 bytes. */
-		err = spi_flash_read(flash, payload_offs, 0x40,
+		err = spi_flash_read(flash, payload_offs, sizeof(*header),
 				     (void *)header);
 		if (err) {
 			debug("%s: Failed to read from SPI flash (err=%d)\n",