diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/profile/ProfileUtilities.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/profile/ProfileUtilities.java
index 9b216e802..be4e6a328 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/profile/ProfileUtilities.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/profile/ProfileUtilities.java
@@ -2350,7 +2350,9 @@ public class ProfileUtilities extends TranslatingUtilities {
       if (d.getIdentity().equals(s.getIdentity())) {
         switch (mappingMergeMode) {
         case APPEND:
-          d.setMap(d.getMap()+";"+s.getMap());
+          if (!Utilities.splitStrings(d.getMap(), "\\,").contains(s.getMap())) {
+            d.setMap(d.getMap()+","+s.getMap());
+          }
           return true;
         case DUPLICATE:
           return false;