diff --git a/plugin/rt/src/lib.rs b/plugin/rt/src/lib.rs
index a8dd8c9b2b..ef7c25d0cd 100644
--- a/plugin/rt/src/lib.rs
+++ b/plugin/rt/src/lib.rs
@@ -41,9 +41,7 @@ static mut BUFFERS: Vec<u8> = Vec::new();
 
 /// Allocate buffer from wasm linear memory
 #[no_mangle]
-pub fn wasm_prepare_buffer(size: i32) -> i32 {
-    unsafe {
-        BUFFERS = Vec::<u8>::with_capacity(size as usize);
-        BUFFERS.as_ptr() as i32
-    }
+pub unsafe fn wasm_prepare_buffer(size: i32) -> i32 {
+    BUFFERS = Vec::<u8>::with_capacity(size as usize);
+    BUFFERS.as_ptr() as i32
 }