diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/TurtleParser.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/TurtleParser.java
index 16fa9b08a..150683490 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/TurtleParser.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/TurtleParser.java
@@ -543,7 +543,7 @@ public class TurtleParser extends ParserBase {
       else
         t.linkedPredicate("a", "sct:" + urlescape(code), null, null);
     } else if ("http://loinc.org".equals(system)) {
-      t.prefix("loinc", "http://loinc.org/rdf#");
+      t.prefix("loinc", "https://loinc.org/rdf/");
       t.linkedPredicate("a", "loinc:"+urlescape(code).toUpperCase(), null, null);
     }  
   }