diff --git a/jina/executors/crafters/numeric/io.py b/jina/executors/crafters/numeric/io.py
index c4e33367f4069..cb4b0de6f0e3f 100644
--- a/jina/executors/crafters/numeric/io.py
+++ b/jina/executors/crafters/numeric/io.py
@@ -22,7 +22,7 @@ def __init__(self, delimiter: str = ',', as_type: str = 'float32', *args, **kwar
         self.delimiter = delimiter
         self.as_type = as_type
 
-    def craft(self, buffer: bytes, doc_id: int, *args, **kwargs) -> List[Dict]:
+    def craft(self, buffer: bytes, doc_id: int, *args, **kwargs) -> Dict:
         """
         Split string into numbers and convert to numpy array