diff --git a/core-foundation-sys/src/lib.rs b/core-foundation-sys/src/lib.rs
index b4e8825..a00e8bb 100644
--- a/core-foundation-sys/src/lib.rs
+++ b/core-foundation-sys/src/lib.rs
@@ -4,3 +4,4 @@ extern crate libc;
 
 pub mod array;
 pub mod base;
+pub mod number;
diff --git a/core-foundation-sys/src/number.rs b/core-foundation-sys/src/number.rs
new file mode 100644
index 0000000..99b9c49
--- /dev/null
+++ b/core-foundation-sys/src/number.rs
@@ -0,0 +1,12 @@
+use libc::c_void;
+
+use base::CFTypeID;
+
+pub type CFBooleanRef = *const c_void;
+
+extern {
+    pub static kCFBooleanTrue: CFBooleanRef;
+    pub static kCFBooleanFalse: CFBooleanRef;
+
+    pub fn CFBooleanGetTypeID() -> CFTypeID;
+}
diff --git a/core-foundation/src/boolean.rs b/core-foundation/src/boolean.rs
index 06b2f57..b8d4288 100644
--- a/core-foundation/src/boolean.rs
+++ b/core-foundation/src/boolean.rs
@@ -9,18 +9,12 @@
 
 //! A Boolean type.
 
-use core_foundation_sys::base::{CFRelease, CFTypeID};
+use core_foundation_sys::base::{CFRelease};
+use core_foundation_sys::number::{CFBooleanRef, CFBooleanGetTypeID, kCFBooleanTrue, kCFBooleanFalse};
 use std::mem;
 
 use base::TCFType;
 
-pub type Boolean = u32;
-
-#[repr(C)]
-struct __CFBoolean;
-
-pub type CFBooleanRef = *const __CFBoolean;
-
 /// A Boolean type.
 ///
 /// FIXME(pcwalton): Should be a newtype struct, but that fails due to a Rust compiler bug.
@@ -49,12 +43,3 @@ impl CFBoolean {
         }
     }
 }
-
-#[link(name = "CoreFoundation", kind = "framework")]
-extern {
-    static kCFBooleanTrue: CFBooleanRef;
-    static kCFBooleanFalse: CFBooleanRef;
-
-    fn CFBooleanGetTypeID() -> CFTypeID;
-}
-