diff --git a/Cargo.toml b/Cargo.toml
index a816d54..9bcd32d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -41,7 +41,6 @@ version = "0.2.4"
 
 [dev-dependencies]
 cocoa = "0.25.0"
-cty = "0.2.1"
 winit = "0.29"
 sema = "0.1.4"
 png = "0.17"
diff --git a/examples/circle/main.rs b/examples/circle/main.rs
index 7124a58..9fb9500 100644
--- a/examples/circle/main.rs
+++ b/examples/circle/main.rs
@@ -20,10 +20,10 @@ use std::mem;
 // based on C++
 #[repr(C)]
 #[derive(Debug)]
-pub struct position(cty::c_float, cty::c_float);
+pub struct position(std::ffi::c_float, std::ffi::c_float);
 #[repr(C)]
 #[derive(Debug)]
-pub struct color(cty::c_float, cty::c_float, cty::c_float);
+pub struct color(std::ffi::c_float, std::ffi::c_float, std::ffi::c_float);
 #[repr(C)]
 #[derive(Debug)]
 pub struct AAPLVertex {