diff --git a/drivers/mtd_sdmmc/mtd_sdmmc.c b/drivers/mtd_sdmmc/mtd_sdmmc.c
index bd70e366bb..790d4e615e 100644
--- a/drivers/mtd_sdmmc/mtd_sdmmc.c
+++ b/drivers/mtd_sdmmc/mtd_sdmmc.c
@@ -41,8 +41,7 @@ static int mtd_sdmmc_init(mtd_dev_t *dev)
     /* get the SDMMC device descriptor from SDMMC peripheral index */
     mtd_sd->sdmmc = sdmmc_get_dev(mtd_sd->sdmmc_idx);
 
-    if ((mtd_sd->sdmmc->init_done == true) ||
-        (sdmmc_card_init(mtd_sd->sdmmc) == 0)) {
+    if (sdmmc_card_init(mtd_sd->sdmmc) == 0) {
         /* erasing whole sectors is handled internally by the card so you can
            delete single blocks (i.e. pages) */
         dev->pages_per_sector = 1;
diff --git a/drivers/sdmmc/sdmmc.c b/drivers/sdmmc/sdmmc.c
index e5b910faf0..6b392e43b7 100644
--- a/drivers/sdmmc/sdmmc.c
+++ b/drivers/sdmmc/sdmmc.c
@@ -338,6 +338,8 @@ int sdmmc_card_init(sdmmc_dev_t *dev)
     assert(dev);
     assert(dev->driver);
 
+    dev->init_done = false;
+
     /* use driver's card_init function if it defines its own */
     if (dev->driver->card_init) {
         return dev->driver->card_init(dev);