diff --git a/benches/affine_transformations.rs b/benches/affine_transformations.rs
index ac68d6e..1b38428 100644
--- a/benches/affine_transformations.rs
+++ b/benches/affine_transformations.rs
@@ -12,9 +12,10 @@ macro_rules! bench {
                 64.try_into().unwrap(),
                 include_bytes!("4_180x180.imgbuf").to_vec(),
             );
-            b.iter(|| {
+            #[allow(unused_unsafe)]
+            b.iter(|| unsafe {
                 for _ in 0..256 {
-                    img.flip_h();
+                    img.$fn();
                 }
             });
         }
diff --git a/src/affine.rs b/src/affine.rs
index f50ba30..7404293 100644
--- a/src/affine.rs
+++ b/src/affine.rs
@@ -27,7 +27,7 @@ impl<const CHANNELS: usize> Image<&mut [u8], CHANNELS> {
     }
 
     /// Flip a image horizontally.
-    fn flip_h(&mut self) {
+    pub fn flip_h(&mut self) {
         for y in 0..self.height() {
             for x in 0..self.width() / 2 {
                 let x2 = self.width() - x - 1;