diff --git a/src/main/java/org/olat/ims/qti21/ui/components/AssessmentRenderFunctions.java b/src/main/java/org/olat/ims/qti21/ui/components/AssessmentRenderFunctions.java
index 03cf91b81a1ab6f74f1dea8643250566537d972d..a2e8566db39079d99e0ca65aefd65f4d195408f6 100644
--- a/src/main/java/org/olat/ims/qti21/ui/components/AssessmentRenderFunctions.java
+++ b/src/main/java/org/olat/ims/qti21/ui/components/AssessmentRenderFunctions.java
@@ -619,7 +619,7 @@ public class AssessmentRenderFunctions {
 	 */
 	
 	public static final String convertLink(AssessmentObjectComponent component, ResolvedAssessmentItem resolvedAssessmentItem, String uri) {
-		if(uri != null && uri.startsWith("http:") || uri.startsWith("https:") || uri.startsWith("mailto:")) {
+		if(uri != null && (uri.startsWith("http:") || uri.startsWith("https:") || uri.startsWith("mailto:"))) {
 			return uri;
 		}