diff --git a/src/drivers/spi/winbond.c b/src/drivers/spi/winbond.c
index a0abeb4ef0..d4f61df480 100644
--- a/src/drivers/spi/winbond.c
+++ b/src/drivers/spi/winbond.c
@@ -192,6 +192,9 @@ struct spi_flash *spi_flash_probe_winbond(struct spi_slave *spi, u8 *idcode)
 	unsigned page_size;
 	unsigned int i;
 
+	if (stm.params)
+		die("Winbond driver already initialized.");
+
 	for (i = 0; i < ARRAY_SIZE(winbond_spi_flash_table); i++) {
 		params = &winbond_spi_flash_table[i];
 		if (params->id == ((idcode[1] << 8) | idcode[2]))