diff --git a/cmd/godoc/main.go b/cmd/godoc/main.go
index 7067a578..eb1217a8 100644
--- a/cmd/godoc/main.go
+++ b/cmd/godoc/main.go
@@ -221,6 +221,7 @@ func main() {
 	corpus.Verbose = *verbose
 	corpus.IndexEnabled = *indexEnabled && httpMode
 	corpus.IndexFiles = *indexFiles
+	corpus.IndexThrottle = *indexThrottle
 	if *writeIndex {
 		corpus.IndexThrottle = 1.0
 	}