diff --git a/main.star b/main.star
index 9836d2f..9d29fde 100644
--- a/main.star
+++ b/main.star
@@ -78,7 +78,7 @@ def run(
     if node_selectors == None:
         node_selectors = {}
 
-    if image="":
+    if image=="":
         image="prom/prometheus:latest"
 
     prometheus_service = plan.add_service(