diff --git a/transform/transform.go b/transform/transform.go
index d3dc7d0..0ea3253 100644
--- a/transform/transform.go
+++ b/transform/transform.go
@@ -41,3 +41,31 @@ func ShuffleURLParameters(request string) string {
 
 	return p.String()
 }
+
+// A path join that chooses its separator based on what is already present in the given parts rather
+// than what OS it is currently running under.
+func UniversalPathJoin(parts ...string) string {
+	if len(parts) == 0 {
+		return ""
+	}
+
+	sep := "/"
+	for _, p := range parts {
+		if strings.Contains(p, "\\") {
+			sep = "\\"
+
+			break
+		}
+	}
+
+	for i, p := range parts {
+		if i == 0 {
+			// keep the root
+			parts[i] = strings.TrimRight(p, "/\\")
+			continue
+		}
+		parts[i] = strings.Trim(p, "/\\")
+	}
+
+	return strings.Join(parts, sep)
+}
diff --git a/transform/transform_test.go b/transform/transform_test.go
index 7799553..6d66094 100644
--- a/transform/transform_test.go
+++ b/transform/transform_test.go
@@ -59,3 +59,19 @@ func TestShuffleParametersInvalid(t *testing.T) {
 		t.Fatal("Invalid URL should be empty", s)
 	}
 }
+
+func TestUniversalPathJoin(t *testing.T) {
+	// unix check
+	want := "/apples/and/potatoes"
+	got := UniversalPathJoin("/apples/and", "potatoes")
+	if got != want {
+		t.Fatalf("Incorrect path recieved: wanted: %s, got: %s", want, got)
+	}
+
+	// windows check
+	want = "C:\\thanks\\for\\fish"
+	got = UniversalPathJoin("C:\\thanks\\for", "fish")
+	if got != want {
+		t.Fatalf("Incorrect path recieved: wanted: %s, got: %s", want, got)
+	}
+}