diff --git a/os/hal/src/mmc_spi.c b/os/hal/src/mmc_spi.c
index 3c3a8c177..d935af8ab 100644
--- a/os/hal/src/mmc_spi.c
+++ b/os/hal/src/mmc_spi.c
@@ -146,7 +146,7 @@ static void wait(MMCDriver *mmcp) {
   for (i = 0; i < 16; i++) {
     spiReceive(mmcp->spip, 1, buf);
     if (buf[0] == 0xFF)
-      break;
+      return;
   }
   /* Looks like it is a long wait.*/
   while (TRUE) {
diff --git a/readme.txt b/readme.txt
index 596160227..b964eea70 100644
--- a/readme.txt
+++ b/readme.txt
@@ -79,6 +79,8 @@
 *****************************************************************************
 
 *** 2.4.1 ***
+- FIX: Fixed MMC over SPI driver performs an unnecessary SPI read (bug
+  3486930).
 - FIX: Fixed Realtime counter initialization in STM32 HALs (bug 3485500).
 - FIX: Fixed PPC port broken when CH_DBG_SYSTEM_STATE_CHECK is activated
   (bug 3485667).