diff --git a/os/hal/platforms/STM32F1xx/hal_lld_f105_f107.h b/os/hal/platforms/STM32F1xx/hal_lld_f105_f107.h
index 44fb70a07..59ba26c35 100644
--- a/os/hal/platforms/STM32F1xx/hal_lld_f105_f107.h
+++ b/os/hal/platforms/STM32F1xx/hal_lld_f105_f107.h
@@ -710,6 +710,7 @@
 /* PLL3 activation conditions.*/
 #if STM32_I2S_CLOCK_REQUIRED ||                                             \
     (STM32_MCOSEL == STM32_MCOSEL_PLL3DIV2) ||                              \
+    (STM32_MCOSEL == STM32_MCOSEL_PLL3) ||                                  \
     defined(__DOXYGEN__)
 /**
  * @brief   PLL3 activation flag.
diff --git a/readme.txt b/readme.txt
index c382b9145..8535973ec 100644
--- a/readme.txt
+++ b/readme.txt
@@ -79,6 +79,7 @@
 *****************************************************************************
 
 *** 2.4.1 ***
+- FIX: Fixed missing PLL3 check in STM32F107 HAL (bug 3485278).
 - FIX: Fixed ADC maximum frequency limit in STM32F2/F4 ADC drivers (bug
   3484947).
 - FIX: Fixed various minor documentation errors (bug 3484942).