diff --git a/collector/pg_stat_bgwriter.go b/collector/pg_stat_bgwriter.go
index f897dbe2..482b74e9 100644
--- a/collector/pg_stat_bgwriter.go
+++ b/collector/pg_stat_bgwriter.go
@@ -122,7 +122,7 @@ func (PGStatBGWriterCollector) Update(ctx context.Context, db *sql.DB, ch chan<-
 
 	var cpt int
 	var cpr int
-	var cpwt int
+	var cpwt float64
 	var cpst int
 	var bcp int
 	var bc int