diff --git a/__internal/memory/src/main.rs b/__internal/memory/src/main.rs
index 858506e..c7fee31 100644
--- a/__internal/memory/src/main.rs
+++ b/__internal/memory/src/main.rs
@@ -1,5 +1,5 @@
 #[no_mangle]
-pub fn malloc_1(len: usize) -> *mut u8 {
+pub unsafe fn malloc_1(len: usize) -> *mut u8 {
     let mut buf = Vec::with_capacity(len);
     let ptr = buf.as_mut_ptr();
     std::mem::forget(buf);
@@ -7,33 +7,35 @@ pub fn malloc_1(len: usize) -> *mut u8 {
 }
 
 #[no_mangle]
-pub fn free_1(ptr: *mut u8, len: usize) {
-    let data = unsafe { Vec::from_raw_parts(ptr, len, len) };
+pub unsafe fn free_1(ptr: *mut u8, len: usize) {
+    let data = Vec::from_raw_parts(ptr, len, len);
     std::mem::drop(data);
 }
 
 #[no_mangle]
-pub fn malloc_2(len: usize) -> *mut u8 {
+pub unsafe fn malloc_2(len: usize) -> *mut u8 {
     let align = std::mem::align_of::<usize>();
-    let layout = unsafe { std::alloc::Layout::from_size_align_unchecked(len, align) };
-    unsafe { std::alloc::alloc(layout) }
+    let layout = std::alloc::Layout::from_size_align_unchecked(len, align);
+    std::alloc::alloc(layout)
 }
 
 #[no_mangle]
-pub fn free_2(ptr: *mut u8, len: usize) {
+pub unsafe fn free_2(ptr: *mut u8, len: usize) {
     let align = std::mem::align_of::<usize>();
-    let layout = unsafe { std::alloc::Layout::from_size_align_unchecked(len, align) };
-    unsafe { std::alloc::dealloc(ptr, layout) }
+    let layout = std::alloc::Layout::from_size_align_unchecked(len, align);
+    std::alloc::dealloc(ptr, layout)
 }
 
 fn main() {
-    println!("Malloc-1");
-    let p = malloc_1(1024);
-    println!("Free-1");
-    free_1(p, 1024);
+    unsafe {
+        println!("Malloc-1");
+        let p = malloc_1(1024);
+        println!("Free-1");
+        free_1(p, 1024);
 
-    println!("Malloc-2");
-    let p = malloc_2(1024);
-    println!("Free-2");
-    free_2(p, 1024);
+        println!("Malloc-2");
+        let p = malloc_2(1024);
+        println!("Free-2");
+        free_2(p, 1024);
+    }
 }