diff --git a/hapi-fhir-base/src/main/java/ca/uhn/fhir/narrative/CustomThymeleafNarrativeGenerator.java b/hapi-fhir-base/src/main/java/ca/uhn/fhir/narrative/CustomThymeleafNarrativeGenerator.java
index bae80cf88d6..5e4057b7175 100644
--- a/hapi-fhir-base/src/main/java/ca/uhn/fhir/narrative/CustomThymeleafNarrativeGenerator.java
+++ b/hapi-fhir-base/src/main/java/ca/uhn/fhir/narrative/CustomThymeleafNarrativeGenerator.java
@@ -70,7 +70,7 @@ public class CustomThymeleafNarrativeGenerator extends BaseThymeleafNarrativeGen
 	public NarrativeTemplateManifest getManifest() {
 		NarrativeTemplateManifest retVal = myManifest;
 		if (myManifest == null) {
-			Validate.isTrue(myPropertyFile != null, "Neither a property file or a manifest has been provided");
+			Validate.notNull(myPropertyFile, "Neither a property file or a manifest has been provided");
 			retVal = NarrativeTemplateManifest.forManifestFileLocation(myPropertyFile);
 			setManifest(retVal);
 		}