diff --git a/crates/api/src/opts/clear_autocmds.rs b/crates/api/src/opts/clear_autocmds.rs
index 8d57a1d8..8e81dcda 100644
--- a/crates/api/src/opts/clear_autocmds.rs
+++ b/crates/api/src/opts/clear_autocmds.rs
@@ -10,6 +10,10 @@ pub struct ClearAutocmdsOpts {
 
     /// Only clear the autocommands local to a specific `Buffer`. Cannot be
     /// used together with [`patterns`](ClearAutocmdsOptsBuilder::patterns).
+    #[cfg(feature = "neovim-0-12")] // On 0.12 and above.
+    #[builder(argtype = "Buffer", inline = "{0}.0")]
+    buf: types::BufHandle,
+    #[cfg(not(feature = "neovim-0-12"))] // On 0.11 and bellow.
     #[builder(argtype = "Buffer", inline = "{0}.0")]
     buffer: types::BufHandle,
 
diff --git a/crates/api/src/opts/create_autocmd.rs b/crates/api/src/opts/create_autocmd.rs
index e4008d60..9f91299a 100644
--- a/crates/api/src/opts/create_autocmd.rs
+++ b/crates/api/src/opts/create_autocmd.rs
@@ -12,6 +12,10 @@ pub struct CreateAutocmdOpts {
     mask: u64,
 
     /// A specific `Buffer` for buffer-local autocommands.
+    #[cfg(feature = "neovim-0-12")] // On 0.12 and above.
+    #[builder(argtype = "Buffer", inline = "{0}.0")]
+    buf: types::BufHandle,
+    #[cfg(not(feature = "neovim-0-12"))] // On 0.11 and bellow.
     #[builder(argtype = "Buffer", inline = "{0}.0")]
     buffer: types::BufHandle,
 
diff --git a/crates/api/src/opts/exec_autocmds.rs b/crates/api/src/opts/exec_autocmds.rs
index be7b37bf..a6832dd1 100644
--- a/crates/api/src/opts/exec_autocmds.rs
+++ b/crates/api/src/opts/exec_autocmds.rs
@@ -10,6 +10,10 @@ pub struct ExecAutocmdsOpts {
 
     /// A specific [`Buffer`] for buffer-local autocommands. Cannot be used
     /// together with [`patterns`](ExecAutocmdsOptsBuilder::patterns).
+    #[cfg(feature = "neovim-0-12")] // On 0.11 and bellow.
+    #[builder(argtype = "Buffer", inline = "{0}.0")]
+    buf: types::BufHandle,
+    #[cfg(not(feature = "neovim-0-12"))] // On 0.12 and above.
     #[builder(argtype = "Buffer", inline = "{0}.0")]
     buffer: types::BufHandle,
 
diff --git a/crates/api/src/opts/get_autocmds.rs b/crates/api/src/opts/get_autocmds.rs
index 6da5ac8e..3114833f 100644
--- a/crates/api/src/opts/get_autocmds.rs
+++ b/crates/api/src/opts/get_autocmds.rs
@@ -44,6 +44,10 @@ pub struct GetAutocmdsOpts {
 
     /// Get the autocommands local to a specific `Buffer`. Cannot be used
     /// together with `patterns`.
+    #[cfg(feature = "neovim-0-12")] // On 0.12 and above.
+    #[builder(argtype = "Buffer", inline = "{0}.into()")]
+    buf: Object,
+    #[cfg(not(feature = "neovim-0-12"))] // On 0.11 and bellow.
     #[builder(argtype = "Buffer", inline = "{0}.into()")]
     buffer: Object,
 }