diff --git a/src/memory.rs b/src/memory.rs
index 4b859d6..730139c 100644
--- a/src/memory.rs
+++ b/src/memory.rs
@@ -316,7 +316,7 @@ impl MemoryInstance {
 
 		unsafe { ::std::ptr::copy(
 			buffer[read_region.range()].as_ptr(),
-			buffer[write_region.range()].as_ptr() as *mut _,
+			buffer[write_region.range()].as_mut_ptr(),
 			len,
 		)}
 
@@ -345,7 +345,7 @@ impl MemoryInstance {
 
 		unsafe { ::std::ptr::copy_nonoverlapping(
 			buffer[read_region.range()].as_ptr(),
-			buffer[write_region.range()].as_ptr() as *mut _,
+			buffer[write_region.range()].as_mut_ptr(),
 			len,
 		)}
 
diff --git a/src/value.rs b/src/value.rs
index 338e574..88b424d 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -1,7 +1,6 @@
 use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 use nan_preserving_float::{F32, F64};
 use std::io;
-use std::mem::transmute;
 use std::{f32, i32, i64, u32, u64};
 use TrapKind;