diff --git a/platforms/nuttx/src/px4/stm/stm32_common/io_pins/io_timer.c b/platforms/nuttx/src/px4/stm/stm32_common/io_pins/io_timer.c
index 495cb3be03..44a82c1652 100644
--- a/platforms/nuttx/src/px4/stm/stm32_common/io_pins/io_timer.c
+++ b/platforms/nuttx/src/px4/stm/stm32_common/io_pins/io_timer.c
@@ -889,6 +889,7 @@ int io_timer_channel_init(unsigned channel, io_timer_channel_mode_t mode,
 
 	case IOTimerChanMode_Capture:
 		setbits = CCMR_C1_CAPTURE_INIT;
+		gpio = timer_io_channels[channel].gpio_in | GPIO_PULLUP;
 		break;
 
 	case IOTimerChanMode_CaptureDMA: