diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index b6a571d866fa..f0fd81409a86 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -659,7 +659,7 @@ struct sdhci_host {
 
 	unsigned int		tuning_count;	/* Timer count for re-tuning */
 	unsigned int		tuning_mode;	/* Re-tuning mode supported by host */
-	unsigned int		tuning_err;	/* Error code for re-tuning */
+	int			tuning_err;	/* Error code for re-tuning */
 #define SDHCI_TUNING_MODE_1	0
 #define SDHCI_TUNING_MODE_2	1
 #define SDHCI_TUNING_MODE_3	2