diff --git a/manifests/params.pp b/manifests/params.pp
index 7d12ac8..688eec4 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -17,6 +17,8 @@
 # @param [String] ps_retention_time tsdb retention time
 # @param [String] ps_retention_size tsdb retention size
 # @param [String] ps_wal_seg_size WAL segment size
+# @param [String] ps_min_block_dur tsdb minimum block duration
+# @param [String] ps_max_block_dur tsdb maximum block duration
 # @param [String] ps_max_mem hard memory ceiling
 # @param [String] ps_high_mem soft limit to make kernel reclaim earlier
 # @param [String] ps_swap_mem allow swap, but limit it
@@ -49,6 +51,8 @@ class prometheus_cd::params (
   String $ps_retention_time     = '15d',
   String $ps_retention_size     = '20GB',
   String $ps_wal_seg_size       = '50MB',
+  String $ps_min_block_dur      = '2h',
+  String $ps_max_block_dur      = '2h',
 
   # service
   String $ps_max_mem            = '6G',
diff --git a/templates/override.conf.erb b/templates/override.conf.erb
index 99c2faf..61f934e 100644
--- a/templates/override.conf.erb
+++ b/templates/override.conf.erb
@@ -18,4 +18,6 @@ ExecStart=/usr/bin/prometheus \
   --storage.tsdb.wal-segment-size=<%= @ps_wal_seg_size %> \
   --web.enable-remote-write-receiver \
   --web.enable-lifecycle \
-  --storage.tsdb.wal-compression
\ No newline at end of file
+  --storage.tsdb.wal-compression \
+  --storage.tsdb.min-block-duration=<%= @ps_min_block_dur %> \
+  --storage.tsdb.max-block-duration=<%= @ps_max_block_dur %>
\ No newline at end of file