diff --git a/os/src/drivers/sd_card/omap4/mmchs.h b/os/src/drivers/sd_card/omap4/mmchs.h
index fba980bc4d..97ac6d70a1 100644
--- a/os/src/drivers/sd_card/omap4/mmchs.h
+++ b/os/src/drivers/sd_card/omap4/mmchs.h
@@ -818,7 +818,7 @@ struct Omap4_hsmmc_controller : private Mmchs, public Sd_card::Host_controller
 			bool result = false;
 
 			/* wait until command is completed, return false on timeout */
-			for (unsigned long i; i < 1000*1000; i++) {
+			for (unsigned long i = 0; i < 1000*1000; i++) {
 				Stat::access_t const stat = read<Stat>();
 				if (Stat::Erri::get(stat)) {
 					PWRN("SD command error");