diff --git a/tools/monitoring_setup.py b/tools/monitoring_setup.py
index 65f43d20..74e14fa1 100644
--- a/tools/monitoring_setup.py
+++ b/tools/monitoring_setup.py
@@ -78,7 +78,7 @@
     },
     {
         "name": "HighMemoryUsage",
-        "expr": "process_resident_memory_bytes / process_resident_memory_bytes > 0.9",
+        "expr": "(process_resident_memory_bytes / 1073741824) > 0.9",
         "duration": "10m",
         "severity": "warning",
         "summary": "High memory usage on {{$labels.instance}}",