diff --git a/sources/stat.h b/sources/stat.h
index 9e37fcb7..26e7afa0 100644
--- a/sources/stat.h
+++ b/sources/stat.h
@@ -7,7 +7,7 @@
  * Scalable PostgreSQL connection pooler.
  */
 
-#define QUANTILES_WINDOW 5
+#define QUANTILES_WINDOW 2
 #define QUANTILES_COMPRESSION 100
 
 typedef struct od_stat_state od_stat_state_t;