diff --git a/drivers/dfu/dfu_sf.c b/drivers/dfu/dfu_sf.c
index 7646c6b7270c1859a6cf10985f65670a3f818bdb..9702eeea202a97f87b9c24b152e335d792b4f49b 100644
--- a/drivers/dfu/dfu_sf.c
+++ b/drivers/dfu/dfu_sf.c
@@ -115,8 +115,10 @@ static struct spi_flash *parse_dev(char *devstr)
 int dfu_fill_entity_sf(struct dfu_entity *dfu, char *devstr, char *s)
 {
 	char *st;
+	char *devstr_bkup = strdup(devstr);
 
-	dfu->data.sf.dev = parse_dev(devstr);
+	dfu->data.sf.dev = parse_dev(devstr_bkup);
+	free(devstr_bkup);
 	if (!dfu->data.sf.dev)
 		return -ENODEV;