diff --git a/libraries/libstratosphere/source/os/impl/os_mutex_impl.hpp b/libraries/libstratosphere/source/os/impl/os_mutex_impl.hpp
index 3396bd88a..5557d39f7 100644
--- a/libraries/libstratosphere/source/os/impl/os_mutex_impl.hpp
+++ b/libraries/libstratosphere/source/os/impl/os_mutex_impl.hpp
@@ -18,7 +18,7 @@
 
 namespace ams::os::impl {
 
-    void PushAndCheckLockLevel(MutexType *mutex);
-    void PopAndCheckLockLevel(MutexType *mutex);
+    void PushAndCheckLockLevel(const MutexType *mutex);
+    void PopAndCheckLockLevel(const MutexType *mutex);
 
 }