diff --git a/os/hal/platforms/STM32F1xx/platform.mk b/os/hal/platforms/STM32F1xx/platform.mk
index 3940dedbe..8a4a3c778 100644
--- a/os/hal/platforms/STM32F1xx/platform.mk
+++ b/os/hal/platforms/STM32F1xx/platform.mk
@@ -5,10 +5,10 @@ PLATFORMSRC = ${CHIBIOS}/os/hal/platforms/STM32F1xx/stm32_dma.c \
               ${CHIBIOS}/os/hal/platforms/STM32F1xx/ext_lld_isr.c \
               ${CHIBIOS}/os/hal/platforms/STM32/can_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/ext_lld.c \
-			  ${CHIBIOS}/os/hal/platforms/STM32/mac_lld.c \
+              ${CHIBIOS}/os/hal/platforms/STM32/mac_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/sdc_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/GPIOv1/pal_lld.c \
-			  ${CHIBIOS}/os/hal/platforms/STM32/I2Cv1/i2c_lld.c \
+              ${CHIBIOS}/os/hal/platforms/STM32/I2Cv1/i2c_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/RTCv1/rtc_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/SPIv1/spi_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/TIMv1/gpt_lld.c \
diff --git a/os/hal/platforms/STM32F4xx/platform.mk b/os/hal/platforms/STM32F4xx/platform.mk
index 99c3263a7..4cebeb169 100644
--- a/os/hal/platforms/STM32F4xx/platform.mk
+++ b/os/hal/platforms/STM32F4xx/platform.mk
@@ -8,7 +8,7 @@ PLATFORMSRC = ${CHIBIOS}/os/hal/platforms/STM32F4xx/stm32_dma.c \
               ${CHIBIOS}/os/hal/platforms/STM32/mac_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/sdc_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/GPIOv2/pal_lld.c \
- 			  ${CHIBIOS}/os/hal/platforms/STM32/I2Cv1/i2c_lld.c \
+              ${CHIBIOS}/os/hal/platforms/STM32/I2Cv1/i2c_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/OTGv1/usb_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/RTCv2/rtc_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/SPIv1/spi_lld.c \
diff --git a/os/hal/platforms/STM32L1xx/platform.mk b/os/hal/platforms/STM32L1xx/platform.mk
index 4678792a5..05a50a362 100644
--- a/os/hal/platforms/STM32L1xx/platform.mk
+++ b/os/hal/platforms/STM32L1xx/platform.mk
@@ -5,7 +5,8 @@ PLATFORMSRC = ${CHIBIOS}/os/hal/platforms/STM32L1xx/stm32_dma.c \
               ${CHIBIOS}/os/hal/platforms/STM32L1xx/ext_lld_isr.c \
               ${CHIBIOS}/os/hal/platforms/STM32/ext_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/GPIOv2/pal_lld.c \
- 			  ${CHIBIOS}/os/hal/platforms/STM32/I2Cv1/i2c_lld.c \
+              ${CHIBIOS}/os/hal/platforms/STM32/I2Cv1/i2c_lld.c \
+              ${CHIBIOS}/os/hal/platforms/STM32/RTCv2/rtc_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/SPIv1/spi_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/TIMv1/gpt_lld.c \
               ${CHIBIOS}/os/hal/platforms/STM32/TIMv1/icu_lld.c \
@@ -19,6 +20,7 @@ PLATFORMINC = ${CHIBIOS}/os/hal/platforms/STM32L1xx \
               ${CHIBIOS}/os/hal/platforms/STM32 \
               ${CHIBIOS}/os/hal/platforms/STM32/GPIOv2 \
               ${CHIBIOS}/os/hal/platforms/STM32/I2Cv1 \
+              ${CHIBIOS}/os/hal/platforms/STM32/RTCv2 \
               ${CHIBIOS}/os/hal/platforms/STM32/SPIv1 \
               ${CHIBIOS}/os/hal/platforms/STM32/TIMv1 \
               ${CHIBIOS}/os/hal/platforms/STM32/USARTv1 \
diff --git a/readme.txt b/readme.txt
index a37766a09..5a429b9e7 100644
--- a/readme.txt
+++ b/readme.txt
@@ -91,6 +91,7 @@
 *** 2.7.0 ***
 - FIX: Fixed timing issue in the STM32 OTGv1 USB driver (bug #436)(backported
   to 2.6.2).
+- FIX: Fixed add RTC to STM32L1 (bug #433)(backported to 2.6.2).
 - FIX: Fixed possible unalignment in GCC Cortex-M scatter files (bug #430)
   (backported to 2.6.2 and 2.4.6).
 - FIX: Fixed PAL driver documentation error (bug #427)(backported to 2.6.1