diff --git a/src/event/source/unix/mio.rs b/src/event/source/unix/mio.rs
index c252f120..f9d595af 100644
--- a/src/event/source/unix/mio.rs
+++ b/src/event/source/unix/mio.rs
@@ -93,7 +93,7 @@ impl EventSource for UnixInternalEventSource {
                 match token {
                     TTY_TOKEN => {
                         loop {
-                            match self.tty_fd.read(&mut self.tty_buffer, TTY_BUFFER_SIZE) {
+                            match self.tty_fd.read(&mut self.tty_buffer) {
                                 Ok(read_count) => {
                                     if read_count > 0 {
                                         self.parser.advance(
diff --git a/src/terminal/sys/file_descriptor.rs b/src/terminal/sys/file_descriptor.rs
index 8df9620a..81c3fb2e 100644
--- a/src/terminal/sys/file_descriptor.rs
+++ b/src/terminal/sys/file_descriptor.rs
@@ -29,12 +29,12 @@ impl FileDesc {
         FileDesc { fd, close_on_drop }
     }
 
-    pub fn read(&self, buffer: &mut [u8], size: usize) -> io::Result<usize> {
+    pub fn read(&self, buffer: &mut [u8]) -> io::Result<usize> {
         let result = unsafe {
             libc::read(
                 self.fd,
                 buffer.as_mut_ptr() as *mut libc::c_void,
-                size as size_t,
+                buffer.len() as size_t,
             )
         };