diff --git a/autoload/vimspector/internal/channel.vim b/autoload/vimspector/internal/channel.vim
index d0cb7d2..3e0d298 100644
--- a/autoload/vimspector/internal/channel.vim
+++ b/autoload/vimspector/internal/channel.vim
@@ -37,22 +37,11 @@ function! s:_OnClose( channel ) abort
   py3 _vimspector_session.OnServerExit( 0 )
 endfunction
 
-function! s:_Send( msg ) abort
-  call ch_sendraw( s:ch, a:msg )
-  return 1
-endfunction
-
-function! vimspector#internal#channel#Timeout( id ) abort
-  py3 << EOF
-_vimspector_session.OnRequestTimeout( vim.eval( 'a:id' ) )
-EOF
-endfunction
-
 function! vimspector#internal#channel#StartDebugSession( config ) abort
 
   if exists( 's:ch' )
     echo 'Channel is already running'
-    return v:none
+    return v:false
   endif
 
   let l:addr = 'localhost:' . a:config[ 'port' ]
@@ -70,10 +59,21 @@ function! vimspector#internal#channel#StartDebugSession( config ) abort
   if ch_status( s:ch ) !=# 'open'
     echom 'Unable to connect to debug adapter'
     redraw
-    return v:none
+    return v:false
   endif
 
-  return funcref( 's:_Send' )
+  return v:true
+endfunction
+
+function! vimspector#internal#channel#Send( msg ) abort
+  call ch_sendraw( s:ch, a:msg )
+  return 1
+endfunction
+
+function! vimspector#internal#channel#Timeout( id ) abort
+  py3 << EOF
+_vimspector_session.OnRequestTimeout( vim.eval( 'a:id' ) )
+EOF
 endfunction
 
 function! vimspector#internal#channel#StopDebugSession() abort
diff --git a/autoload/vimspector/internal/job.vim b/autoload/vimspector/internal/job.vim
index 26ba117..530acb3 100644
--- a/autoload/vimspector/internal/job.vim
+++ b/autoload/vimspector/internal/job.vim
@@ -39,35 +39,11 @@ function! s:_OnClose( channel ) abort
   redraw
 endfunction
 
-function! s:_Send( msg ) abort
-  if ! exists( 's:job' )
-    echom "Can't send message: Job was not initialised correctly"
-    redraw
-    return 0
-  endif
-
-  if job_status( s:job ) !=# 'run'
-    echom "Can't send message: Job is not running"
-    redraw
-    return 0
-  endif
-
-  let ch = job_getchannel( s:job )
-  if ch ==# 'channel fail'
-    echom 'Channel was closed unexpectedly!'
-    redraw
-    return 0
-  endif
-
-  call ch_sendraw( ch, a:msg )
-  return 1
-endfunction
-
 function! vimspector#internal#job#StartDebugSession( config ) abort
   if exists( 's:job' )
     echom 'Not starging: Job is already running'
     redraw
-    return v:none
+    return v:false
   endif
 
   let s:job = job_start( a:config[ 'command' ],
@@ -91,10 +67,34 @@ function! vimspector#internal#job#StartDebugSession( config ) abort
   if job_status( s:job ) !=# 'run'
     echom 'Unable to start job, status is: ' . job_status( s:job )
     redraw
-    return v:none
+    return v:false
   endif
 
-  return funcref( 's:_Send' )
+  return v:true
+endfunction
+
+function! vimspector#internal#job#Send( msg ) abort
+  if ! exists( 's:job' )
+    echom "Can't send message: Job was not initialised correctly"
+    redraw
+    return 0
+  endif
+
+  if job_status( s:job ) !=# 'run'
+    echom "Can't send message: Job is not running"
+    redraw
+    return 0
+  endif
+
+  let ch = job_getchannel( s:job )
+  if ch ==# 'channel fail'
+    echom 'Channel was closed unexpectedly!'
+    redraw
+    return 0
+  endif
+
+  call ch_sendraw( ch, a:msg )
+  return 1
 endfunction
 
 function! vimspector#internal#job#StopDebugSession() abort
diff --git a/python3/vimspector/debug_session.py b/python3/vimspector/debug_session.py
index 8eec9f4..edaf75c 100644
--- a/python3/vimspector/debug_session.py
+++ b/python3/vimspector/debug_session.py
@@ -492,19 +492,18 @@ class DebugSession( object ):
       self._adapter[ 'cwd' ] = os.getcwd()
 
     vim.vars[ '_vimspector_adapter_spec' ] = self._adapter
-    channel_send_func = vim.bindeval(
-        "vimspector#internal#{}#StartDebugSession( "
-        "  g:_vimspector_adapter_spec "
-        ")".format( self._connection_type ) )
-
-    if channel_send_func is None:
+    if not vim.eval( "vimspector#internal#{}#StartDebugSession( "
+                     "  g:_vimspector_adapter_spec "
+                     ")".format( self._connection_type ) ):
       self._logger.error( "Unable to start debug server" )
     else:
       self._connection = debug_adapter_connection.DebugAdapterConnection(
         self,
-        channel_send_func )
+        lambda msg: utils.Call(
+          "vimspector#internal#{}#Send".format( self._connection_type ),
+          msg ) )
 
-      self._logger.info( 'Debug Adapter Started' )
+    self._logger.info( 'Debug Adapter Started' )
 
   def _StopDebugAdapter( self, callback = None ):
     def handler( *args ):
diff --git a/python3/vimspector/utils.py b/python3/vimspector/utils.py
index ba930ba..6fea1c5 100644
--- a/python3/vimspector/utils.py
+++ b/python3/vimspector/utils.py
@@ -449,3 +449,17 @@ def ToUnicode( b ):
   if isinstance( b, bytes ):
     return b.decode( 'utf-8' )
   return b
+
+
+# Call a vimscript function with suplied arguments.
+def Call( vimscript_function, *args ):
+  call = vimscript_function + '('
+  for index, arg in enumerate( args ):
+    arg_name = 'vimspector_internal_arg_{}'.format( index )
+    vim.vars[ arg_name ] = arg
+    call += 'g:' + arg_name
+    if index:
+      call += ','
+
+  call += ')'
+  vim.eval( call )