diff --git a/Cargo.toml b/Cargo.toml
index f42a851..4d16967 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,4 +30,3 @@ camino = "1.1.6"
 # linking system ffmpeg as fallback.
 link_system_ffmpeg = ["rusty_ffmpeg/link_system_ffmpeg"]
 ffmpeg6 = ["rusty_ffmpeg/ffmpeg6"]
-ffmpeg7 = ["rusty_ffmpeg/ffmpeg7"]
diff --git a/src/avformat/avio.rs b/src/avformat/avio.rs
index ae2d79e..2683f07 100644
--- a/src/avformat/avio.rs
+++ b/src/avformat/avio.rs
@@ -102,18 +102,11 @@ impl AVIOContextCustom {
                 let opaque = unsafe { (opaque as *mut Opaque).as_mut() }.unwrap();
                 opaque.read_packet.as_mut().unwrap()(&mut opaque.data, buf)
             }
-            #[cfg(not(feature = "ffmpeg7"))]
             unsafe extern "C" fn write_c(opaque: *mut c_void, data: *mut u8, len: i32) -> i32 {
                 let buf = unsafe { slice::from_raw_parts(data, len as usize) };
                 let opaque = unsafe { (opaque as *mut Opaque).as_mut() }.unwrap();
                 opaque.write_packet.as_mut().unwrap()(&mut opaque.data, buf)
             }
-            #[cfg(feature = "ffmpeg7")]
-            unsafe extern "C" fn write_c(opaque: *mut c_void, data: *const u8, len: i32) -> i32 {
-                let buf = unsafe { slice::from_raw_parts(data, len as usize) };
-                let opaque = unsafe { (opaque as *mut Opaque).as_mut() }.unwrap();
-                opaque.write_packet.as_mut().unwrap()(&mut opaque.data, buf)
-            }
             unsafe extern "C" fn seek_c(opaque: *mut c_void, offset: i64, whence: i32) -> i64 {
                 let opaque = unsafe { (opaque as *mut Opaque).as_mut() }.unwrap();
                 opaque.seek.as_mut().unwrap()(&mut opaque.data, offset, whence)