diff --git a/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_death_stack_v3/interfaces-impl/bsp.cpp b/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_death_stack_v3/interfaces-impl/bsp.cpp
index 369b9f4002f8d29a6f4af63bb46d19c33191844d..e642dcc2032bfad95b7dce10edd049d6b71d2391 100644
--- a/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_death_stack_v3/interfaces-impl/bsp.cpp
+++ b/miosix/arch/cortexM4_stm32f4/stm32f429zi_skyward_death_stack_v3/interfaces-impl/bsp.cpp
@@ -437,7 +437,7 @@ void IRQbspInit()
 
     expulsion::servo::mode(Mode::ALTERNATE);
     expulsion::servo::alternateFunction(2);
-    expulsion::sense::mode(Mode::INPUT_PULL_DOWN);
+    expulsion::sense::mode(Mode::INPUT_PULL_UP);
     expulsion::nosecone_detach::mode(Mode::INPUT);
 
     cutter::enable::mode(Mode::OUTPUT);