diff --git a/roles/prometheus/templates/prometheus/alert.rules.yml.j2 b/roles/prometheus/templates/prometheus/alert.rules.yml.j2
index 8df9288f..477ed057 100644
--- a/roles/prometheus/templates/prometheus/alert.rules.yml.j2
+++ b/roles/prometheus/templates/prometheus/alert.rules.yml.j2
@@ -16,8 +16,9 @@ groups:
       summary: "{{ $labels.instance }} ({{ $labels.job }}) est invisible depuis plus de 3 minutes !"
 
   # Alert for out of memory
+  # Do not take into account memory not used by apps
   - alert: OutOfMemory
-    expr: (node_memory_MemFree_bytes + node_memory_Cached_bytes + node_memory_Buffers_bytes) / node_memory_MemTotal_bytes * 100 < 10
+    expr: (node_memory_MemFree_bytes + node_memory_Cached_bytes + node_memory_Buffers_bytes + node_memory_PageTables_bytes + node_memory_VmallocUsed_bytes + node_memory_SwapCached_bytes + node_memory_Slab_bytes) / node_memory_MemTotal_bytes * 100 < 10
     for: 5m
     labels:
       severity: warning