diff --git a/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/ToolingExtensions.java b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/ToolingExtensions.java
index f6ccb59ea..6fd89a645 100644
--- a/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/ToolingExtensions.java
+++ b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/ToolingExtensions.java
@@ -577,7 +577,7 @@ public class ToolingExtensions {
       return;
     
     Extension extension = new Extension().setUrl(EXT_TRANSLATION);
-    extension.addExtension().setUrl("lang").setValue(new StringType(lang));
+    extension.addExtension().setUrl("lang").setValue(new CodeType(lang));
     extension.addExtension().setUrl("content").setValue(new StringType(value));
     element.getExtension().add(extension);
   }
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java
index 58556ca60..5de039fde 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java
@@ -577,7 +577,7 @@ public class ToolingExtensions {
       return;
     
     Extension extension = new Extension().setUrl(EXT_TRANSLATION);
-    extension.addExtension().setUrl("lang").setValue(new StringType(lang));
+    extension.addExtension().setUrl("lang").setValue(new CodeType(lang));
     extension.addExtension().setUrl("content").setValue(new StringType(value));
     element.getExtension().add(extension);
   }