diff --git a/src/cache.rs b/src/cache.rs
index d19bbfe..3858f0d 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -175,7 +175,7 @@ impl<'a> Cache<'a> {
                     Ok(_) => {
                         let file_path = Path::new(&cache_path_str);
                         match File::create(file_path) {
-                            Ok(mut file) => {
+                            Ok(_) => {
                                 // Save the file into the cache
                                 match image.save(file_path) {
                                     Ok(_) => {}
diff --git a/src/hash/ahash.rs b/src/hash/ahash.rs
index c9580e0..7da57ce 100644
--- a/src/hash/ahash.rs
+++ b/src/hash/ahash.rs
@@ -12,7 +12,7 @@ use cache::Cache;
 use super::prepare_image;
 use super::{HashType, PerceptualHash, Precision, PreparedImage};
 
-use self::image::{GenericImage, GenericImageView};
+use self::image::GenericImageView;
 
 pub struct AHash<'a> {
     prepared_image: Box<PreparedImage<'a>>,
diff --git a/src/hash/dhash.rs b/src/hash/dhash.rs
index 1e29520..c322928 100644
--- a/src/hash/dhash.rs
+++ b/src/hash/dhash.rs
@@ -11,7 +11,7 @@ use cache::Cache;
 use super::prepare_image;
 use super::{HashType, PerceptualHash, Precision, PreparedImage};
 
-use self::image::{GenericImage, GenericImageView};
+use self::image::GenericImageView;
 
 pub struct DHash<'a> {
     prepared_image: Box<PreparedImage<'a>>,
diff --git a/src/hash/phash.rs b/src/hash/phash.rs
index 5bf41a6..487dbfc 100644
--- a/src/hash/phash.rs
+++ b/src/hash/phash.rs
@@ -14,7 +14,7 @@ use super::image::Pixel;
 use super::prepare_image;
 use super::{HashType, PerceptualHash, Precision, PreparedImage};
 
-use self::image::{DynamicImage, GenericImage, GenericImageView};
+use self::image::{DynamicImage, GenericImageView};
 
 pub struct PHash<'a> {
     prepared_image: Box<PreparedImage<'a>>,
diff --git a/src/lib.rs b/src/lib.rs
index 3f52cac..1788676 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -123,7 +123,7 @@ pub extern "C" fn ext_free(raw_lib: *const libc::c_void) {
 }
 
 #[no_mangle]
-pub extern "C" fn ext_get_ahash(lib: &PIHash, path_char: *const libc::c_char) -> libc::uint64_t {
+pub extern "C" fn ext_get_ahash(lib: &PIHash, path_char: *const libc::c_char) -> u64 {
     unsafe {
         let path_str = CStr::from_ptr(path_char);
         let image_path = match path_str.to_str() {
@@ -143,7 +143,7 @@ pub extern "C" fn ext_get_ahash(lib: &PIHash, path_char: *const libc::c_char) ->
 }
 
 #[no_mangle]
-pub extern "C" fn ext_get_dhash(lib: &PIHash, path_char: *const libc::c_char) -> libc::uint64_t {
+pub extern "C" fn ext_get_dhash(lib: &PIHash, path_char: *const libc::c_char) -> u64 {
     unsafe {
         let path_str = CStr::from_ptr(path_char);
         let image_path = match path_str.to_str() {
@@ -163,7 +163,7 @@ pub extern "C" fn ext_get_dhash(lib: &PIHash, path_char: *const libc::c_char) ->
 }
 
 #[no_mangle]
-pub extern "C" fn ext_get_phash(lib: &PIHash, path_char: *const libc::c_char) -> libc::uint64_t {
+pub extern "C" fn ext_get_phash(lib: &PIHash, path_char: *const libc::c_char) -> u64 {
     unsafe {
         let path_str = CStr::from_ptr(path_char);
         let image_path = match path_str.to_str() {
@@ -184,9 +184,9 @@ pub extern "C" fn ext_get_phash(lib: &PIHash, path_char: *const libc::c_char) ->
 
 #[repr(C)]
 pub struct PIHashes {
-    ahash: libc::uint64_t,
-    dhash: libc::uint64_t,
-    phash: libc::uint64_t,
+    ahash: u64,
+    dhash: u64,
+    phash: u64,
 }
 
 #[no_mangle]