diff --git a/autoload/ale/path.vim b/autoload/ale/path.vim
index 89b119f4..ca3afc52 100644
--- a/autoload/ale/path.vim
+++ b/autoload/ale/path.vim
@@ -197,15 +197,18 @@ function! ale#path#ToURI(path) abort
 endfunction
 
 function! ale#path#FromURI(uri) abort
-    let l:i = len('file://')
-    let l:encoded_path = a:uri[: l:i - 1] is# 'file://' ? a:uri[l:i :] : a:uri
-
-    let l:path = ale#uri#Decode(l:encoded_path)
-
-    " If the path is like /C:/foo/bar, it should be C:\foo\bar instead.
-    if l:path =~# '^/[a-zA-Z]:'
-        let l:path = substitute(l:path[1:], '/', '\\', 'g')
+    if a:uri[:6] is? 'file://'
+        let l:encoded_path = a:uri[7:]
+    elseif a:uri[:4] is? 'file:'
+        let l:encoded_path = a:uri[5:]
+    else
+        let l:encoded_path = a:uri
     endif
 
-    return l:path
+    " If the path is like /C:/foo/bar, it should be C:\foo\bar instead.
+    if l:encoded_path =~# '^/[a-zA-Z]:'
+        let l:encoded_path = substitute(l:encoded_path[1:], '/', '\\', 'g')
+    endif
+
+    return ale#uri#Decode(l:encoded_path)
 endfunction
diff --git a/test/test_path_uri.vader b/test/test_path_uri.vader
index a3e68d98..504aba77 100644
--- a/test/test_path_uri.vader
+++ b/test/test_path_uri.vader
@@ -2,8 +2,22 @@ Execute(ale#path#ToURI should work for Windows paths):
   AssertEqual 'file:///C:/foo/bar/baz.tst', ale#path#ToURI('C:\foo\bar\baz.tst')
   AssertEqual 'foo/bar/baz.tst', ale#path#ToURI('foo\bar\baz.tst')
 
+Execute(ale#path#FromURI should work for Unix paths):
+  AssertEqual '/foo/bar/baz.tst', ale#path#FromURI('file:///foo/bar/baz.tst')
+  AssertEqual '/foo/bar/baz.tst', ale#path#FromURI('file:/foo/bar/baz.tst')
+  AssertEqual '/foo/bar/baz.tst', ale#path#FromURI('FILE:///foo/bar/baz.tst')
+  AssertEqual '/foo/bar/baz.tst', ale#path#FromURI('FILE:/foo/bar/baz.tst')
+
 Execute(ale#path#FromURI should work for Windows paths):
   AssertEqual 'C:\foo\bar\baz.tst', ale#path#FromURI('file:///C:/foo/bar/baz.tst')
+  AssertEqual 'C:\foo\bar\baz.tst', ale#path#FromURI('file:/C:/foo/bar/baz.tst')
+  AssertEqual 'c:\foo\bar\baz.tst', ale#path#FromURI('file:///c:/foo/bar/baz.tst')
+  AssertEqual 'c:\foo\bar\baz.tst', ale#path#FromURI('file:/c:/foo/bar/baz.tst')
+  AssertEqual 'C:\foo\bar\baz.tst', ale#path#FromURI('FILE:///C:/foo/bar/baz.tst')
+  AssertEqual 'C:\foo\bar\baz.tst', ale#path#FromURI('FILE:/C:/foo/bar/baz.tst')
+
+Execute(ale#path#FromURI should handle encoded paths that look like drive letters):
+  AssertEqual '/C:/foo/bar/baz.tst', ale#path#FromURI('file:///C%3A/foo/bar/baz.tst')
 
 Execute(ale#path#ToURI should work for Unix paths):
   AssertEqual 'file:///foo/bar/baz.tst', ale#path#ToURI('/foo/bar/baz.tst')