diff --git a/cmd/camtool/sync.go b/cmd/camtool/sync.go
index 8547197e9..4a1f45792 100644
--- a/cmd/camtool/sync.go
+++ b/cmd/camtool/sync.go
@@ -155,7 +155,7 @@ func (c *syncCmd) storageFromParam(which storageType, val string) (blobserver.St
 	if looksLikePath(val) {
 		disk, err := localdisk.New(val)
 		if err != nil {
-			return nil, fmt.Errorf("Interpreted --%v=%q as a local disk path, but got error: %v", val, err)
+			return nil, fmt.Errorf("Interpreted --%v=%q as a local disk path, but got error: %v", which, val, err)
 		}
 		return disk, nil
 	}