diff --git a/library/camel-kamelets-catalog/src/main/resources/kamelets/timer-source.kamelet.yaml b/library/camel-kamelets-catalog/src/main/resources/kamelets/timer-source.kamelet.yaml
index be6057cbd..4171a4bc6 100644
--- a/library/camel-kamelets-catalog/src/main/resources/kamelets/timer-source.kamelet.yaml
+++ b/library/camel-kamelets-catalog/src/main/resources/kamelets/timer-source.kamelet.yaml
@@ -63,5 +63,5 @@ spec:
             constant: "{{message}}"
         - set-header:
             name: "Content-Type"
-            constant: "{{contentType}"
+            constant: "{{contentType}}"
         - to: kamelet:sink