diff --git a/cmd/acb/summarize.go b/cmd/acb/summarize.go
index e6cadfd..ccc3e8d 100644
--- a/cmd/acb/summarize.go
+++ b/cmd/acb/summarize.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"os"
 	"time"
 
 	"o5r.ca/autocrossbow/contributions"