diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java
index 019eced4d7..c443371c06 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java
@@ -551,7 +551,7 @@ else if (!s.toString().endsWith(File.separator))
         a = a.substring(File.separator.length());
       
       while (a.startsWith(".."+File.separator)) {
-        String p = s.toString().substring(0, s.length()-1);
+        String p = a.toString().substring(0, a.length()-1);
         if (!p.contains(File.separator)) {
           s = new StringBuilder();
         } else {