diff --git a/demos/STM32/NIL-STM32L011K4-NUCLEO32/mcuconf.h b/demos/STM32/NIL-STM32L011K4-NUCLEO32/mcuconf.h
index 064707691..733485505 100644
--- a/demos/STM32/NIL-STM32L011K4-NUCLEO32/mcuconf.h
+++ b/demos/STM32/NIL-STM32L011K4-NUCLEO32/mcuconf.h
@@ -62,7 +62,6 @@
 #define STM32_LPUART1SEL                    STM32_LPUART1SEL_APB
 #define STM32_I2C1SEL                       STM32_I2C1SEL_APB
 #define STM32_LPTIM1SEL                     STM32_LPTIM1SEL_APB
-#define STM32_HSI48SEL                      STM32_HSI48SEL_HSI48
 
 /*
  * ADC driver system settings.
diff --git a/demos/STM32/RT-STM32L031K6-NUCLEO32/mcuconf.h b/demos/STM32/RT-STM32L031K6-NUCLEO32/mcuconf.h
index 21f900cdd..183375896 100644
--- a/demos/STM32/RT-STM32L031K6-NUCLEO32/mcuconf.h
+++ b/demos/STM32/RT-STM32L031K6-NUCLEO32/mcuconf.h
@@ -63,7 +63,6 @@
 #define STM32_LPUART1SEL                    STM32_LPUART1SEL_APB
 #define STM32_I2C1SEL                       STM32_I2C1SEL_APB
 #define STM32_LPTIM1SEL                     STM32_LPTIM1SEL_APB
-#define STM32_HSI48SEL                      STM32_HSI48SEL_HSI48
 
 /*
  * ADC driver system settings.
diff --git a/os/hal/ports/STM32/STM32L0xx/hal_lld.h b/os/hal/ports/STM32/STM32L0xx/hal_lld.h
index 1d93ac4c5..94d28c565 100644
--- a/os/hal/ports/STM32/STM32L0xx/hal_lld.h
+++ b/os/hal/ports/STM32/STM32L0xx/hal_lld.h
@@ -512,7 +512,7 @@
  * @bief    USB/RNG clock source.
  */
 #if !defined(STM32_HSI48SEL) || defined(__DOXYGEN__)
-#define STM32_HSI48SEL                      STM32_HSI48SEL_HSI48
+#define STM32_HSI48SEL                      STM32_HSI48SEL_USBPLL
 #endif
 /** @} */
 
diff --git a/readme.txt b/readme.txt
index 11488342e..801a7ae26 100644
--- a/readme.txt
+++ b/readme.txt
@@ -97,6 +97,8 @@
        (backported to 17.6.1).
 - HAL: Fixed STM32 USARTv2 serial incorrect buffer size declarations
        (bug #871)(backported to 17.6.1).
+- HAL: Fixed bug in STM32L0xx port related to STM32L0x1 (bug #870)
+       (backported to 17.6.1).
 - HAL: Fixed board file configuration for STM32F3 Discovery REVC (bug #869)
        (backported to 17.6.1).
 - HAL: Fixed wrong PPRE2 and LSI related macros in STM32L0 hal lld (bug #868)