diff --git a/native/src/init/lib.rs b/native/src/init/lib.rs
index 9034d0d56..49946e04a 100644
--- a/native/src/init/lib.rs
+++ b/native/src/init/lib.rs
@@ -98,9 +98,9 @@ pub mod ffi {
         fn patch_ro_root(self: &mut MagiskInit);
 
         // Used in C++
-        unsafe fn setup_tmp(self: &MagiskInit, path: *const c_char);
+        unsafe fn setup_tmp(self: &mut MagiskInit, path: *const c_char);
         fn collect_devices(self: &MagiskInit);
-        fn mount_preinit_dir(self: &MagiskInit);
+        fn mount_preinit_dir(self: &mut MagiskInit);
         unsafe fn find_block(self: &MagiskInit, partname: *const c_char) -> u64;
         unsafe fn patch_fissiond(self: &mut MagiskInit, tmp_path: *const c_char);
     }
diff --git a/native/src/init/mount.cpp b/native/src/init/mount.cpp
index 852affa5c..44a01c6d5 100644
--- a/native/src/init/mount.cpp
+++ b/native/src/init/mount.cpp
@@ -103,11 +103,11 @@ uint64_t MagiskInit::find_block(const char *partname) const noexcept {
     return 0;
 }
 
-void MagiskInit::mount_preinit_dir() const noexcept {
+void MagiskInit::mount_preinit_dir() noexcept {
     if (preinit_dev.empty()) return;
-    auto dev = find_block(preinit_dev.data());
+    auto dev = find_block(preinit_dev.c_str());
     if (dev == 0) {
-        LOGE("Cannot find preinit %s, abort!\n", preinit_dev.data());
+        LOGE("Cannot find preinit %s, abort!\n", preinit_dev.c_str());
         return;
     }
     xmknod(PREINITDEV, S_IFBLK | 0600, dev);
@@ -138,7 +138,7 @@ void MagiskInit::mount_preinit_dir() const noexcept {
         }
         xumount2(MIRRDIR, MNT_DETACH);
     } else {
-        PLOGE("Failed to mount preinit %s\n", preinit_dev.data());
+        PLOGE("Failed to mount preinit %s\n", preinit_dev.c_str());
         unlink(PREINITDEV);
     }
 }
@@ -210,7 +210,7 @@ mount_root:
     return is_two_stage;
 }
 
-void MagiskInit::setup_tmp(const char *path) const noexcept {
+void MagiskInit::setup_tmp(const char *path) noexcept {
     LOGD("Setup Magisk tmp at %s\n", path);
     chdir("/data");