diff --git a/CHANGELOG.md b/CHANGELOG.md
index da9e5fb8b2..8bdf7d823b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## [5.1.5] - 2022-12-22
+
+### Fixed
+* Call ignoreFile.IsIgnored with absolute path. [#2656](https://github.com/fsprojects/fantomas/pull/2656)
+
 ## [5.1.4] - 2022-11-30
 
 ### Fixed
diff --git a/src/Fantomas.Tests/Integration/DaemonTests.fs b/src/Fantomas.Tests/Integration/DaemonTests.fs
index 84eb3885e2..74730dd6ca 100644
--- a/src/Fantomas.Tests/Integration/DaemonTests.fs
+++ b/src/Fantomas.Tests/Integration/DaemonTests.fs
@@ -320,3 +320,32 @@ let add (a : int) (b : int) = //
 "
             | otherResponse -> Assert.Fail $"Unexpected response %A{otherResponse}"
         })
+
+[<Test>]
+let ``format nested ignored file`` () =
+    runWithDaemon (fun client ->
+        async {
+            let sourceCode = "let foo = 4"
+
+            use codeFile =
+                new TemporaryFileCodeSample(
+                    sourceCode,
+                    fileName = "NicePrint",
+                    subFolders = [| "src"; "Compiler"; "Checking" |]
+                )
+
+            use _ignoreFixture = new FantomasIgnoreFile("src/Compiler/Checking/NicePrint.fs")
+
+            let request =
+                { SourceCode = sourceCode
+                  FilePath = codeFile.Filename
+                  Config = None }
+
+            let! response =
+                client.InvokeAsync<FormatDocumentResponse>(Methods.FormatDocument, request)
+                |> Async.AwaitTask
+
+            match response with
+            | FormatDocumentResponse.IgnoredFile _ -> Assert.Pass()
+            | otherResponse -> Assert.Fail $"Unexpected response %A{otherResponse}"
+        })
diff --git a/src/Fantomas/IgnoreFile.fs b/src/Fantomas/IgnoreFile.fs
index 09d0fdff5b..87032b6520 100644
--- a/src/Fantomas/IgnoreFile.fs
+++ b/src/Fantomas/IgnoreFile.fs
@@ -3,9 +3,20 @@ namespace Fantomas
 open System.IO.Abstractions
 open Ignore
 
+type AbsoluteFilePath =
+    private
+    | AbsoluteFilePath of string
+
+    member x.Path =
+        let (AbsoluteFilePath(path)) = x
+        path
+
+    static member Create (fs: IFileSystem) (filePath: string) =
+        fs.Path.GetFullPath filePath |> AbsoluteFilePath
+
 /// The string argument is taken relative to the location
 /// of the ignore-file.
-type IsPathIgnored = string -> bool
+type IsPathIgnored = AbsoluteFilePath -> bool
 
 type IgnoreFile =
     { Location: IFileInfo
@@ -46,7 +57,7 @@ module IgnoreFile =
             (Ignore(), lines)
             ||> Array.fold (fun (ig: Ignore) (line: string) -> ig.Add(line))
 
-        fun path ->
+        fun (absoluteFilePath: AbsoluteFilePath) ->
             // See https://git-scm.com/docs/gitignore
             // We transform the incoming path relative to the .ignoreFilePath folder.
             // In a cli scenario that is the current directory, for the daemon it is the first found ignore file.
@@ -54,7 +65,7 @@ module IgnoreFile =
             let relativePath =
                 fs
                     .Path
-                    .GetRelativePath(fs.Directory.GetParent(ignoreFilePath).FullName, path)
+                    .GetRelativePath(fs.Directory.GetParent(ignoreFilePath).FullName, absoluteFilePath.Path)
                     .Replace("\\", "/")
 
             fantomasIgnore.IsIgnored(relativePath)
@@ -74,19 +85,10 @@ module IgnoreFile =
         | None -> false
         | Some ignoreFile ->
             let fs = ignoreFile.Location.FileSystem
-            let fullPath = fs.Path.GetFullPath(file)
+            let fullPath = AbsoluteFilePath.Create fs file
 
             try
-                let path =
-                    if fullPath.StartsWith ignoreFile.Location.Directory.FullName then
-                        fullPath.[ignoreFile.Location.Directory.FullName.Length + 1 ..]
-                    else
-                        // This scenario is a bit unexpected - it suggests that we are
-                        // trying to ask an ignorefile whether a file that is outside
-                        // its dependency tree is ignored.
-                        fullPath
-
-                ignoreFile.IsIgnored path
+                ignoreFile.IsIgnored fullPath
             with ex ->
                 printfn "%A" ex
                 false
diff --git a/src/Fantomas/IgnoreFile.fsi b/src/Fantomas/IgnoreFile.fsi
index b735d51450..4f1440a342 100644
--- a/src/Fantomas/IgnoreFile.fsi
+++ b/src/Fantomas/IgnoreFile.fsi
@@ -2,9 +2,16 @@ namespace Fantomas
 
 open System.IO.Abstractions
 
+type AbsoluteFilePath =
+    private
+    | AbsoluteFilePath of string
+
+    member Path: string
+    static member Create: fs: IFileSystem -> filePath: string -> AbsoluteFilePath
+
 /// The string argument is taken relative to the location
 /// of the ignore-file.
-type IsPathIgnored = string -> bool
+type IsPathIgnored = AbsoluteFilePath -> bool
 
 type IgnoreFile =
     { Location: IFileInfo
@@ -19,14 +26,14 @@ module IgnoreFile =
     /// Note that this is intended for use only in the daemon; the command-line tool
     /// does not support `.fantomasignore` files anywhere other than the current
     /// working directory.
-    val find: fs: IFileSystem -> loadIgnoreList: (string -> string -> bool) -> filePath: string -> IgnoreFile option
+    val find: fs: IFileSystem -> loadIgnoreList: (string -> IsPathIgnored) -> filePath: string -> IgnoreFile option
 
     val loadIgnoreList: fs: IFileSystem -> ignoreFilePath: string -> IsPathIgnored
 
     val internal current':
         fs: IFileSystem ->
         currentDirectory: string ->
-        loadIgnoreList: (string -> string -> bool) ->
+        loadIgnoreList: (string -> IsPathIgnored) ->
             Lazy<IgnoreFile option>
 
     /// When executed from the command line, Fantomas will not dynamically locate