diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
index 9e26d2305..4bcbf8466 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
@@ -773,6 +773,11 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     txCache = new TerminologyCache(lock, cachePath);
   }
 
+  public void clearTSCache(String url) throws Exception {
+    txCache.removeCS(url);
+  }
+
+  
   @Override
   public List<ConceptMap> findMapsForSource(String url) throws FHIRException {
     synchronized (lock) {
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/TerminologyCache.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/TerminologyCache.java
index 1608323e2..536fd4995 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/TerminologyCache.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/TerminologyCache.java
@@ -460,6 +460,15 @@ public class TerminologyCache {
   public static void setNoCaching(boolean noCaching) {
     TerminologyCache.noCaching = noCaching;
   }
+
+  public void removeCS(String url) {
+    synchronized (lock) {
+      String name = getNameForSystem(url);
+      if (caches.containsKey(name)) {
+        caches.remove(name);
+      }
+    }   
+  }
  
   
 }
\ No newline at end of file