diff --git a/CSharp/Tests/Tests1/Tests/TestLines.cs b/CSharp/Tests/Tests1/Tests/TestLines.cs
index e26e27f2..78cf4b26 100644
--- a/CSharp/Tests/Tests1/Tests/TestLines.cs
+++ b/CSharp/Tests/Tests1/Tests/TestLines.cs
@@ -16,7 +16,7 @@ public void TestOpenPaths()
         Paths64 subj = new(), subj_open = new(), clip = new();
         Paths64 solution = new(), solution_open = new();
 
-        Assert.IsTrue(ClipperFileIO.LoadTestNum("..\\..\\..\\..\\..\\..\\Tests\\Lines.txt",
+        Assert.IsTrue(ClipperFileIO.LoadTestNum("../../../../../../Tests/Lines.txt",
           i, subj, subj_open, clip, out ClipType clipType, out FillRule fillrule,  
           out long area, out int count, out _),
             string.Format("Loading test {0} failed.", i));
diff --git a/CSharp/Tests/Tests1/Tests/TestPolygons.cs b/CSharp/Tests/Tests1/Tests/TestPolygons.cs
index 2a0a3535..8773a240 100644
--- a/CSharp/Tests/Tests1/Tests/TestPolygons.cs
+++ b/CSharp/Tests/Tests1/Tests/TestPolygons.cs
@@ -24,7 +24,7 @@ public void TestClosedPaths()
         Paths64 subj = new(), subj_open = new (), clip = new();
         Paths64 solution = new(), solution_open = new();
 
-        if (!ClipperFileIO.LoadTestNum("..\\..\\..\\..\\..\\..\\Tests\\Polygons.txt",
+        if (!ClipperFileIO.LoadTestNum("../../../../../../Tests/Polygons.txt",
           testNum, subj, subj_open, clip, out ClipType clipType, out FillRule fillrule, 
           out long storedArea, out int storedCount, out _))
         {          
diff --git a/CSharp/Tests/Tests1/Tests/TestPolytree.cs b/CSharp/Tests/Tests1/Tests/TestPolytree.cs
index 0301cfeb..a469114c 100644
--- a/CSharp/Tests/Tests1/Tests/TestPolytree.cs
+++ b/CSharp/Tests/Tests1/Tests/TestPolytree.cs
@@ -61,7 +61,7 @@ public void TestPolytree2()
     {
       Paths64 subject = new(), subjectOpen = new(), clip = new();
 
-      Assert.IsTrue(ClipperFileIO.LoadTestNum("..\\..\\..\\..\\..\\..\\Tests\\PolytreeHoleOwner2.txt",
+      Assert.IsTrue(ClipperFileIO.LoadTestNum("../../../../../../Tests/PolytreeHoleOwner2.txt",
         1, subject, subjectOpen, clip, out ClipType cliptype, out FillRule fillrule, 
         out _, out _, out _),
           "Unable to read PolytreeHoleOwner2.txt");