diff --git a/ext_interface.hpp b/ext_interface.hpp
index deb21d8..de34fef 100644
--- a/ext_interface.hpp
+++ b/ext_interface.hpp
@@ -8,4 +8,4 @@
  *
  * @return Number of boot attempts left
  **/
-int getBootCount();
+uint32_t getBootCount();