diff --git a/src/cmd.rs b/src/cmd.rs
index 151df4a..dddf1d9 100644
--- a/src/cmd.rs
+++ b/src/cmd.rs
@@ -4,7 +4,7 @@
 
 use core::future::Future;
 
-use crate::controller::{blocking, CmdError, ControllerCmdAsync, ControllerCmdSync, ErrorType};
+use crate::controller::{CmdError, ControllerCmdAsync, ControllerCmdSync, ErrorType};
 use crate::param::param;
 use crate::{FixedSizeValue, FromHciBytes, HostToControllerPacket, PacketKind, WriteHci};
 
@@ -103,13 +103,6 @@ pub trait AsyncCmd: Cmd {
     ) -> impl Future<Output = Result<(), CmdError<<C as ErrorType>::Error>>> {
         controller.exec(self)
     }
-
-    fn exec_blocking<C: blocking::ControllerCmdAsync<Self>>(
-        &self,
-        controller: &C,
-    ) -> Result<(), blocking::TryError<CmdError<<C as ErrorType>::Error>>> {
-        controller.exec(self)
-    }
 }
 
 pub trait CmdReturnBuf: Copy + AsRef<[u8]> + AsMut<[u8]> {
@@ -153,13 +146,6 @@ pub trait SyncCmd: Cmd {
     ) -> impl Future<Output = Result<Self::Return, CmdError<<C as ErrorType>::Error>>> {
         controller.exec(self)
     }
-
-    fn exec_blocking<C: blocking::ControllerCmdSync<Self>>(
-        &self,
-        controller: &C,
-    ) -> Result<Self::Return, blocking::TryError<CmdError<<C as ErrorType>::Error>>> {
-        controller.exec(self)
-    }
 }
 
 #[macro_export]
diff --git a/src/controller/blocking.rs b/src/controller/blocking.rs
index 8c02cf0..2b1c4e1 100644
--- a/src/controller/blocking.rs
+++ b/src/controller/blocking.rs
@@ -1,8 +1,4 @@
-use crate::{
-    cmd,
-    controller::{CmdError, ErrorType},
-    data, ControllerToHostPacket,
-};
+use crate::{controller::ErrorType, data, ControllerToHostPacket};
 
 pub trait Controller: ErrorType {
     fn write_acl_data(&self, packet: &data::AclPacket) -> Result<(), Self::Error>;
@@ -23,11 +19,3 @@ pub enum TryError<E> {
     Error(E),
     Busy,
 }
-
-pub trait ControllerCmdSync<C: cmd::SyncCmd + ?Sized>: Controller {
-    fn exec(&self, cmd: &C) -> Result<C::Return, TryError<CmdError<Self::Error>>>;
-}
-
-pub trait ControllerCmdAsync<C: cmd::AsyncCmd + ?Sized>: Controller {
-    fn exec(&self, cmd: &C) -> Result<(), TryError<CmdError<Self::Error>>>;
-}