diff --git a/libuavcan_drivers/stm32/driver/src/uc_stm32_clock.cpp b/libuavcan_drivers/stm32/driver/src/uc_stm32_clock.cpp
index 42a51da079..97762423a6 100644
--- a/libuavcan_drivers/stm32/driver/src/uc_stm32_clock.cpp
+++ b/libuavcan_drivers/stm32/driver/src/uc_stm32_clock.cpp
@@ -32,7 +32,7 @@
 # if UAVCAN_STM32_NUTTX
 #  define TIMX                    UAVCAN_STM32_GLUE3(STM32_TIM, UAVCAN_STM32_TIMER_NUMBER, _BASE)
 #  define  TMR_REG(o)              (TIMX + (o))
-#  define TIMX_INPUT_CLOCK         STM32_TIM27_FREQUENCY
+#  define TIMX_INPUT_CLOCK         UAVCAN_STM32_GLUE3(STM32_APB1_TIM, UAVCAN_STM32_TIMER_NUMBER, _CLKIN)
 
 #  define TIMX_IRQn                UAVCAN_STM32_GLUE2(STM32_IRQ_TIM, UAVCAN_STM32_TIMER_NUMBER)
 # endif