diff --git a/ICSharpCode.Decompiler.Tests/ILPrettyTestRunner.cs b/ICSharpCode.Decompiler.Tests/ILPrettyTestRunner.cs
index 6ec521e54..11be019f1 100644
--- a/ICSharpCode.Decompiler.Tests/ILPrettyTestRunner.cs
+++ b/ICSharpCode.Decompiler.Tests/ILPrettyTestRunner.cs
@@ -371,7 +371,7 @@ namespace ICSharpCode.Decompiler.Tests
 			{
 				if (File.Exists(Path.Combine(TestCasePath, "FSharp.Core.dll")))
 					return;
-				string fsharpCoreDll = Path.Combine(TestCasePath, "..\\..\\..\\ILSpy-tests\\FSharp\\FSharp.Core.dll");
+				string fsharpCoreDll = Path.Combine(TestCasePath, "..", "..", "..", "ILSpy-tests", "FSharp", "FSharp.Core.dll");
 				if (!File.Exists(fsharpCoreDll))
 					Assert.Ignore("Ignored because of missing ILSpy-tests repo. Must be checked out separately from https://github.com/icsharpcode/ILSpy-tests!");
 				File.Copy(fsharpCoreDll, Path.Combine(TestCasePath, "FSharp.Core.dll"));