diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageHacker.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageHacker.java
index 928e7d0d3..ae63fbc85 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageHacker.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/PackageHacker.java
@@ -142,7 +142,7 @@ public class PackageHacker {
 
     // https://github.com/HL7/fhir-ig-publisher/issues/295
     if (webref.contains("hl7.org/fhir/us/core/STU4.0.0")) {
-      webref.replace("hl7.org/fhir/us/core/STU4.0.0", "hl7.org/fhir/us/core/STU4");
+      return webref.replace("hl7.org/fhir/us/core/STU4.0.0", "hl7.org/fhir/us/core/STU4");
     }
 
     if (isUseSecureReferences()) {