diff --git a/os/hal/ports/STM32/STM32F7xx/hal_lld.h b/os/hal/ports/STM32/STM32F7xx/hal_lld.h
index 24498264e..47c91b62c 100644
--- a/os/hal/ports/STM32/STM32F7xx/hal_lld.h
+++ b/os/hal/ports/STM32/STM32F7xx/hal_lld.h
@@ -1997,7 +1997,7 @@
  */
 #if (STM32_SDMMC1SEL == STM32_SDMMC1SEL_PLL48CLK) || defined(__DOXYGEN__)
 #define STM32_SDMMC1CLK              STM32_PLL48CLK
-#elif STM32_SDMMC1SEL == STM32_SDMMCSEL_SYSCLK
+#elif STM32_SDMMC1SEL == STM32_SDMMC1SEL_SYSCLK
 #define STM32_SDMMC1CLK              STM32_SYSCLK
 #else
 #error "invalid source selected for SDMMC1 clock"
@@ -2006,9 +2006,9 @@
 /**
  * @brief   SDMMC2 frequency.
  */
-#if (STM32_SDMMC2SEL == STM32_SDMMC1SEL_PLL48CLK) || defined(__DOXYGEN__)
+#if (STM32_SDMMC2SEL == STM32_SDMMC2SEL_PLL48CLK) || defined(__DOXYGEN__)
 #define STM32_SDMMC2CLK              STM32_PLL48CLK
-#elif STM32_SDMMC2SEL == STM32_SDMMCSEL_SYSCLK
+#elif STM32_SDMMC2SEL == STM32_SDMMC2SEL_SYSCLK
 #define STM32_SDMMC2CLK              STM32_SYSCLK
 #else
 #error "invalid source selected for SDMMC2 clock"
diff --git a/readme.txt b/readme.txt
index 99067edb3..8f59dfb04 100644
--- a/readme.txt
+++ b/readme.txt
@@ -110,6 +110,8 @@
 - EX:  Updated LIS302DL to 1.1.0 (backported to 18.2.1).
 - EX:  Updated LPS25H to 1.1.0 (backported to 18.2.1).
 - EX:  Updated LSM303DLHC to 1.1.0 (backported to 18.2.1).
+- HAL: Fixed invalid clock checks for SDMMC1 and SDMMC2 on STM32F7xx
+       (bug #928)(backported to 18.2.1 and 17.6.4).
 - HAL: Fixed useless writes in read-only CFGR_SWS field on all STM32Fxx
        (bug #927)(backported to 18.2.1 and 17.6.4).
 - HAL: Fixed typo in hal_pal.h (bug #926)(backported to 18.2.1).