diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/OperationOutcome.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/OperationOutcome.java
index 603aba49e..f34dfed78 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/OperationOutcome.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/OperationOutcome.java
@@ -1299,6 +1299,15 @@ For resource issues, this will be a simple XPath limited to element names, repet
 
   }
 
+  @Override
+  public String toString() {
+    if (getExpression().size() == 1) {
+      return getExpression().get(0)+" "+getDiagnostics()+" "+getSeverity().toCode()+"/"+getCode().toCode()+": "+getDetails().getText();
+    } else {
+      return getExpression()+" "+getDiagnostics()+" "+getSeverity().toCode()+"/"+getCode().toCode()+": "+getDetails().getText();
+    }
+  }
+
   }
 
     /**