diff --git a/deps/teagba/include/teagba/addresses.hpp b/deps/teagba/include/teagba/addresses.hpp
index 6d3bf183..e84bc8bd 100644
--- a/deps/teagba/include/teagba/addresses.hpp
+++ b/deps/teagba/include/teagba/addresses.hpp
@@ -49,7 +49,7 @@ using BgCtl = uint16_t;
 #define REG_BG3CTL *reinterpret_cast<volatile BgCtl*>(0x0400'000e)
 
 [[nodiscard]]
-inline auto &regBgCtl(auto bgIdx) noexcept {
+inline auto &regBgCtl(uintptr_t bgIdx) noexcept {
 	return *reinterpret_cast<volatile BgCtl*>(0x0400'0008 + 2 * bgIdx);
 }