diff --git a/src/hdu/data/asciitable.rs b/src/hdu/data/asciitable.rs
index c836584..66123ec 100644
--- a/src/hdu/data/asciitable.rs
+++ b/src/hdu/data/asciitable.rs
@@ -13,7 +13,7 @@ use crate::hdu::header::extension::Xtension;
 
 impl<'a, R> DataBufRead<'a, AsciiTable> for Cursor<R>
 where
-    R: AsRef<[u8]> + Debug + Read + 'a,
+    R: AsRef<[u8]> + Debug + 'a,
 {
     type Data = Data<'a>;
 
diff --git a/src/hdu/data/bintable.rs b/src/hdu/data/bintable.rs
index 1dfba5d..ef8d9fd 100644
--- a/src/hdu/data/bintable.rs
+++ b/src/hdu/data/bintable.rs
@@ -15,7 +15,7 @@ use crate::hdu::header::extension::Xtension;
 
 impl<'a, R> DataBufRead<'a, BinTable> for Cursor<R>
 where
-    R: AsRef<[u8]> + Debug + Read + 'a,
+    R: AsRef<[u8]> + Debug + 'a,
 {
     type Data = Data<'a>;
 
diff --git a/src/hdu/data/image.rs b/src/hdu/data/image.rs
index bc4950d..a0ee317 100644
--- a/src/hdu/data/image.rs
+++ b/src/hdu/data/image.rs
@@ -16,7 +16,7 @@ use crate::hdu::DataBufRead;
 
 impl<'a, R> DataBufRead<'a, Image> for Cursor<R>
 where
-    R: AsRef<[u8]> + Debug + Read + 'a,
+    R: AsRef<[u8]> + Debug + 'a,
 {
     type Data = Data<'a>;