diff --git a/autoload/doge.vim b/autoload/doge.vim
index 97ac69c2..297c592a 100644
--- a/autoload/doge.vim
+++ b/autoload/doge.vim
@@ -108,5 +108,29 @@ function! doge#command_complete(...) abort
   return filter(copy(get(b:, 'doge_supported_doc_standards', [])), "v:val =~ '^'.a:1")
 endfunction
 
+""
+" @public
+" This function will be triggered on the FileType autocmd and will remove
+" conflicting doc standards from the previous filetype.
+function! doge#on_filetype_change() abort
+  if !exists('b:doge_prev_supported_doc_standards') && exists('b:doge_supported_doc_standards')
+    " Save the current supported doc standards
+    let b:doge_prev_supported_doc_standards = copy(get(b:, 'doge_supported_doc_standards', []))
+  elseif exists('b:doge_prev_supported_doc_standards') && exists('b:doge_supported_doc_standards')
+    " Remove all the doc standards from the previous filetype.
+    for l:doc in get(b:, 'doge_prev_supported_doc_standards', [])
+      if has_key(get(b:, 'doge_patterns', {}), l:doc)
+        unlet b:doge_patterns[l:doc]
+      endif
+
+      let l:doc_idx = index(get(b:, 'doge_supported_doc_standards', []), l:doc)
+      if l:doc_idx >= 0
+        call remove(b:doge_supported_doc_standards, l:doc_idx)
+      endif
+    endfor
+    let b:doge_prev_supported_doc_standards = copy(b:doge_supported_doc_standards)
+  endif
+endfunction
+
 let &cpoptions = s:save_cpo
 unlet s:save_cpo
diff --git a/doc/doge.txt b/doc/doge.txt
index df4ce7a7..bbf71ca7 100644
--- a/doc/doge.txt
+++ b/doc/doge.txt
@@ -110,6 +110,10 @@ doge#deactivate()                                          *doge#deactivate()*
 doge#command_complete()                              *doge#command_complete()*
   Return a list of supported doc standards for the current buffer.
 
+doge#on_filetype_change()                          *doge#on_filetype_change()*
+  This function will be triggered on the FileType autocmd and will remove
+  conflicting doc standards from the previous filetype.
+
 doge#buffer#get_supported_doc_standards({defaults})
                                    *doge#buffer#get_supported_doc_standards()*
   'defaults': A list of supported doc standards that should be allowed.
diff --git a/doc/tags b/doc/tags
index 3cc34e56..0fc0208d 100644
--- a/doc/tags
+++ b/doc/tags
@@ -19,6 +19,7 @@ doge#helpers#keyseq()	doge.txt	/*doge#helpers#keyseq()*
 doge#helpers#placeholder()	doge.txt	/*doge#helpers#placeholder()*
 doge#helpers#trim()	doge.txt	/*doge#helpers#trim()*
 doge#indent#add()	doge.txt	/*doge#indent#add()*
+doge#on_filetype_change()	doge.txt	/*doge#on_filetype_change()*
 doge#pattern#custom()	doge.txt	/*doge#pattern#custom()*
 doge#pattern#generate()	doge.txt	/*doge#pattern#generate()*
 doge#python#file()	doge.txt	/*doge#python#file()*
diff --git a/plugin/doge.vim b/plugin/doge.vim
index 408ae799..f38c3ece 100644
--- a/plugin/doge.vim
+++ b/plugin/doge.vim
@@ -171,6 +171,7 @@ augroup doge
   autocmd TextChangedI * call doge#comment#update_interactive_comment_info()
   autocmd InsertLeave  * call doge#comment#deactivate_when_done()
   autocmd TextChanged  * call doge#comment#deactivate_when_done()
+  autocmd FileType     * call doge#on_filetype_change()
 augroup END
 
 let &cpoptions = s:save_cpo
diff --git a/test/autocmd-filetype.vader b/test/autocmd-filetype.vader
new file mode 100644
index 00000000..db375c1d
--- /dev/null
+++ b/test/autocmd-filetype.vader
@@ -0,0 +1,26 @@
+# ==============================================================================
+# Switch from PHP to JavaScript and make sure doc standards of PHP get removed.
+# ==============================================================================
+
+Execute (switch from PHP to JavaScript):
+  setfiletype php
+  AssertEqual exists('b:doge_prev_supported_doc_standards'), 1
+  AssertEqual has_key(b:doge_patterns, 'phpdoc'), 1
+  AssertEqual has_key(b:doge_patterns, 'jsdoc'), 0
+
+  Assert index(b:doge_supported_doc_standards, 'phpdoc') >= 0
+  Assert index(b:doge_supported_doc_standards, 'jsdoc') < 0
+
+  Assert index(b:doge_prev_supported_doc_standards, 'phpdoc') >= 0
+  Assert index(b:doge_prev_supported_doc_standards, 'jsdoc') < 0
+
+# Change to JavaScript and make sure the phpdoc gets removed.
+  setfiletype javascript
+  AssertEqual 0, has_key(b:doge_patterns, 'phpdoc')
+  AssertEqual 1, has_key(b:doge_patterns, 'jsdoc')
+
+  Assert index(b:doge_supported_doc_standards, 'phpdoc') < 0
+  Assert index(b:doge_supported_doc_standards, 'jsdoc') >=  0
+
+  Assert index(b:doge_prev_supported_doc_standards, 'phpdoc') < 0
+  Assert index(b:doge_prev_supported_doc_standards, 'jsdoc') >= 0