diff --git a/os/hal/src/mmc_spi.c b/os/hal/src/mmc_spi.c
index 3a5958ec8..fbdb92c03 100644
--- a/os/hal/src/mmc_spi.c
+++ b/os/hal/src/mmc_spi.c
@@ -448,6 +448,7 @@ bool_t mmcConnect(MMCDriver *mmcp) {
 
   /* Connection procedure in progress.*/
   mmcp->state = BLK_CONNECTING;
+  mmcp->block_addresses = FALSE;
 
   /* Slow clock mode and 128 clock pulses.*/
   spiStart(mmcp->config->spip, mmcp->config->lscfg);
diff --git a/readme.txt b/readme.txt
index e6ebde01a..448031888 100644
--- a/readme.txt
+++ b/readme.txt
@@ -89,6 +89,8 @@
 *****************************************************************************
 
 *** 2.7.0 ***
+- FIX: Fixed MMC_SPI driver block_addresses is not initialized after
+  reconnection (bug #485)(backported to 2.6.4).
 - FIX: Fixed STM32L1 Plus Compilation Problems (bug #484)(backported to 2.6.4).
 - FIX: Fixed OTG HS failure when WFI instruction is enabled (bug #482)
   (backported to 2.6.4).