diff --git a/src/encoding/json/encode.go b/src/encoding/json/encode.go
index d53e862d73bce9..075c198c646f85 100644
--- a/src/encoding/json/encode.go
+++ b/src/encoding/json/encode.go
@@ -370,6 +370,7 @@ func typeEncoder(t reflect.Type) encoderFunc {
 		f(e, v, opts)
 	}))
 	if loaded {
+		wg.Done()
 		return fi.(encoderFunc)
 	}