diff --git a/autoload/ale/path.vim b/autoload/ale/path.vim
index 94de252d..00e31310 100644
--- a/autoload/ale/path.vim
+++ b/autoload/ale/path.vim
@@ -116,7 +116,7 @@ function! ale#path#Dirname(path) abort
     endif
 
     " For /foo/bar/ we need :h:h to get /foo
-    if a:path[-1:] is# '/'
+    if a:path[-1:] is# '/' || (has('win32') && a:path[-1:] is# '\')
         return fnamemodify(a:path, ':h:h')
     endif
 
diff --git a/test/test_path_dirname.vader b/test/test_path_dirname.vader
index 79b78d29..818a62a8 100644
--- a/test/test_path_dirname.vader
+++ b/test/test_path_dirname.vader
@@ -6,3 +6,8 @@ Execute(ale#path#Dirname should return empty strings should be returned for empt
 Execute(ale#path#Dirname should return the dirname of paths):
   AssertEqual '/foo', ale#path#Dirname('/foo/bar')
   AssertEqual '/foo', ale#path#Dirname('/foo/bar/')
+
+  if has('win32')
+    AssertEqual 'C:\foo', ale#path#Dirname('C:\foo\bar')
+    AssertEqual 'C:\foo', ale#path#Dirname('C:\foo\bar\')
+  endif