diff --git a/rust_src/src/vterm.rs b/rust_src/src/vterm.rs
index 0128f21fb14..241cfe1c2ba 100644
--- a/rust_src/src/vterm.rs
+++ b/rust_src/src/vterm.rs
@@ -17,7 +17,7 @@ use crate::{
     remacs_sys::{
         allocate_vterm, color_to_rgb_string, get_col_offset, mysave_value, refresh_lines,
         rgb_string_to_color, row_to_linenr, term_process_key, vterm_output_read,
-        vterm_sb_buffer_size, vterm_screen_callbacks, vterm_screen_set_callbacks,
+        vterm_screen_callbacks, vterm_screen_set_callbacks,VtermScrollbackLine
     },
 
     remacs_sys::{
@@ -129,7 +129,8 @@ pub fn vterm_new_lisp(rows: EmacsInt, cols: EmacsInt, process: LispObject) -> Li
         (*term).sb_current = 0;
         (*term).sb_pending = 0;
 
-        vterm_sb_buffer_size(term.as_mut() as *mut vterminal);
+        let s = mem::size_of::<VtermScrollbackLine>() * MaximumScrollback;
+        (*term).sb_buffer = libc::malloc(s as libc::size_t) as *mut *mut VtermScrollbackLine;
 
         (*term).invalid_start = 0;
         (*term).invalid_end = rows as c_int;
@@ -138,6 +139,8 @@ pub fn vterm_new_lisp(rows: EmacsInt, cols: EmacsInt, process: LispObject) -> Li
 
         val
     }
+
+
 }
 
 #[no_mangle]
diff --git a/src/vterm.c b/src/vterm.c
index 7fe3cd5970f..fc65e18a4e1 100644
--- a/src/vterm.c
+++ b/src/vterm.c
@@ -363,12 +363,6 @@ VTermScreenCallbacks vterm_screen_callbacks = {
     
 };
 
-void
-vterm_sb_buffer_size (vterminal *term) {
-  int sb_size = 1000;
-  term->sb_buffer = malloc(sizeof(VtermScrollbackLine *) * term->sb_size);
-}
-
 bool
 vterm_module_copy_string_contents (Lisp_Object lisp_str, char *buffer, ptrdiff_t *length)
 {