diff --git a/libsqlite3-sys/src/lib.rs b/libsqlite3-sys/src/lib.rs
index b4b5186..5d37276 100644
--- a/libsqlite3-sys/src/lib.rs
+++ b/libsqlite3-sys/src/lib.rs
@@ -5,7 +5,7 @@ extern crate libc;
 pub use self::bindgen::*;
 
 use std::mem;
-use libc::{c_int, c_void};
+use libc::c_int;
 
 mod bindgen;
 
@@ -48,10 +48,12 @@ pub const SQLITE_TEXT    : c_int = 3;
 pub const SQLITE_BLOB    : c_int = 4;
 pub const SQLITE_NULL    : c_int = 5;
 
-pub type SqliteDestructor = extern "C" fn(*mut c_void);
+pub fn SQLITE_STATIC() -> sqlite3_destructor_type {
+    Some(unsafe { mem::transmute(0isize) })
+}
 
-pub fn SQLITE_TRANSIENT() -> SqliteDestructor {
-    unsafe { mem::transmute(-1isize) }
+pub fn SQLITE_TRANSIENT() -> sqlite3_destructor_type {
+    Some(unsafe { mem::transmute(-1isize) })
 }
 
 pub fn code_to_str(code: c_int) -> &'static str {
diff --git a/src/types.rs b/src/types.rs
index 1900d1d..1d30b30 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -104,7 +104,7 @@ impl<'a> ToSql for &'a str {
     unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
         match str_to_cstring(self) {
             Ok(c_str) => ffi::sqlite3_bind_text(stmt, col, c_str.as_ptr(), -1,
-                                                Some(ffi::SQLITE_TRANSIENT())),
+                                                ffi::SQLITE_TRANSIENT()),
             Err(_)    => ffi::SQLITE_MISUSE,
         }
     }
@@ -119,8 +119,7 @@ impl ToSql for String {
 impl<'a> ToSql for &'a [u8] {
     unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
         ffi::sqlite3_bind_blob(
-            stmt, col, mem::transmute(self.as_ptr()), self.len() as c_int,
-            Some(ffi::SQLITE_TRANSIENT()))
+            stmt, col, mem::transmute(self.as_ptr()), self.len() as c_int, ffi::SQLITE_TRANSIENT())
     }
 }