diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/ProfileUtilities.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/ProfileUtilities.java
index 8280ff898..47e3c716c 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/ProfileUtilities.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/ProfileUtilities.java
@@ -2514,7 +2514,7 @@ public class ProfileUtilities extends TranslatingUtilities {
         url.startsWith("observation.html") || 
         url.startsWith("datatypes.html") || 
         url.startsWith("narrative.html") || 
-        (url.startsWith("extension-") || url.contains(".html")) || 
+        (url.startsWith("extension-") && url.contains(".html")) || 
         url.startsWith("resource-definitions.html");
   }