diff --git a/NGSEngine/src/ngsgfx/src/backend/metal/src/metal-rs/src/lib.rs b/NGSEngine/src/ngsgfx/src/backend/metal/src/metal-rs/src/lib.rs
index 0aa723e2..88a6201a 100644
--- a/NGSEngine/src/ngsgfx/src/backend/metal/src/metal-rs/src/lib.rs
+++ b/NGSEngine/src/ngsgfx/src/backend/metal/src/metal-rs/src/lib.rs
@@ -274,13 +274,13 @@ impl CAMetalLayer {
 
     pub fn set_presents_with_transaction(&self, transaction: bool) {
         unsafe {
-            msg_send![self.0, setPresentsWithTransaction:transaction];
+            msg_send![self.0, setPresentsWithTransaction:transaction]
         }
     }
 
     pub fn set_framebuffer_only(&self, framebuffer_only: bool) {
         unsafe {
-            msg_send![self.0, setFramebufferOnly:framebuffer_only];
+            msg_send![self.0, setFramebufferOnly:framebuffer_only]
         }
     }
 
@@ -304,7 +304,7 @@ impl CAMetalLayer {
 
     pub fn remove_all_animations(&self) {
         unsafe {
-            msg_send![self.0, removeAllAnimations];
+            msg_send![self.0, removeAllAnimations]
         }
     }
 
diff --git a/NGSEngine/src/ngsgfx/src/wsi/metal/src/lib.rs b/NGSEngine/src/ngsgfx/src/wsi/metal/src/lib.rs
index e275e6de..8861df61 100644
--- a/NGSEngine/src/ngsgfx/src/wsi/metal/src/lib.rs
+++ b/NGSEngine/src/ngsgfx/src/wsi/metal/src/lib.rs
@@ -233,7 +233,7 @@ impl wsi_core::NewWindow for MetalWindow {
 
             let ns_cs_name = NSString::alloc(ptr::null_mut()).init_str(cs_name);
             let colorspace = CGColorSpaceCreateWithName(mem::transmute(ns_cs_name));
-            msg_send![ns_cs_name, release];
+            let () = msg_send![ns_cs_name, release];
 
             layer.set_edge_antialiasing_mask(0);
             layer.set_masks_to_bounds(true);
diff --git a/NGSEngine/src/zangfx/src/backend/metal/src/metal-rs/src/lib.rs b/NGSEngine/src/zangfx/src/backend/metal/src/metal-rs/src/lib.rs
index 2af6f5bd..e2707733 100644
--- a/NGSEngine/src/zangfx/src/backend/metal/src/metal-rs/src/lib.rs
+++ b/NGSEngine/src/zangfx/src/backend/metal/src/metal-rs/src/lib.rs
@@ -274,13 +274,13 @@ impl CAMetalLayer {
 
     pub fn set_presents_with_transaction(&self, transaction: bool) {
         unsafe {
-            msg_send![self.0, setPresentsWithTransaction:transaction];
+            msg_send![self.0, setPresentsWithTransaction:transaction]
         }
     }
 
     pub fn set_framebuffer_only(&self, framebuffer_only: bool) {
         unsafe {
-            msg_send![self.0, setFramebufferOnly:framebuffer_only];
+            msg_send![self.0, setFramebufferOnly:framebuffer_only]
         }
     }
 
@@ -304,7 +304,7 @@ impl CAMetalLayer {
 
     pub fn remove_all_animations(&self) {
         unsafe {
-            msg_send![self.0, removeAllAnimations];
+            msg_send![self.0, removeAllAnimations]
         }
     }