diff --git a/_data/rules.yml b/_data/rules.yml
index 9c889ce..3db80f5 100644
--- a/_data/rules.yml
+++ b/_data/rules.yml
@@ -1050,7 +1050,7 @@ groups:
             rules:
               - name: JVM memory filling up
                 description: JVM memory is filling up (> 80%)
-                query: 'jvm_memory_bytes_used / jvm_memory_bytes_max{area="heap"} > 0.8'
+                query: '(jvm_memory_used_bytes{area="heap"} / jvm_memory_max_bytes{area="heap"}) * 100 > 80'
                 severity: warning
 
       - name: Sidekiq