diff --git a/modules/monitoring.nix b/modules/monitoring.nix
index 4afe5f1..d020e12 100644
--- a/modules/monitoring.nix
+++ b/modules/monitoring.nix
@@ -5,6 +5,7 @@
     enable = true;
     port = 9090;
     retentionTime = "30d";
+    extraFlags = [ "--storage.tsdb.retention.size=1GB" ];
 
     exporters = {
       node = {