diff --git a/src/buffer.rs b/src/buffer.rs
index 15860ec628..2c3404feab 100644
--- a/src/buffer.rs
+++ b/src/buffer.rs
@@ -1077,13 +1077,13 @@ pub(crate) type BgrImage = ImageBuffer<Bgr<u8>, Vec<u8>>;
 /// Sendable Bgr + alpha channel image buffer
 pub(crate) type BgraImage = ImageBuffer<Bgra<u8>, Vec<u8>>;
 /// Sendable 16-bit Rgb image buffer
-pub type Rgb16Image = ImageBuffer<Rgb<u16>, Vec<u16>>;
+pub(crate) type Rgb16Image = ImageBuffer<Rgb<u16>, Vec<u16>>;
 /// Sendable 16-bit Rgb + alpha channel image buffer
-pub type Rgba16Image = ImageBuffer<Rgba<u16>, Vec<u16>>;
+pub(crate) type Rgba16Image = ImageBuffer<Rgba<u16>, Vec<u16>>;
 /// Sendable 16-bit grayscale image buffer
-pub type Gray16Image = ImageBuffer<Luma<u16>, Vec<u16>>;
+pub(crate) type Gray16Image = ImageBuffer<Luma<u16>, Vec<u16>>;
 /// Sendable 16-bit grayscale + alpha channel image buffer
-pub type GrayAlpha16Image = ImageBuffer<LumaA<u16>, Vec<u16>>;
+pub(crate) type GrayAlpha16Image = ImageBuffer<LumaA<u16>, Vec<u16>>;
 
 #[cfg(test)]
 mod test {
diff --git a/src/lib.rs b/src/lib.rs
index f596f5dbcb..fd30489024 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -54,10 +54,6 @@ pub use buffer::{ConvertBuffer,
                  Pixel,
                  RgbImage,
                  RgbaImage,
-                 Rgb16Image,
-                 Rgba16Image,
-                 Gray16Image,
-                 GrayAlpha16Image,
                  };
 
 pub use flat::FlatSamples;