diff --git a/api/services/annotation_service.py b/api/services/annotation_service.py
index 80dd63bf89..cfa917daf6 100644
--- a/api/services/annotation_service.py
+++ b/api/services/annotation_service.py
@@ -280,7 +280,7 @@ class AppAnnotationService:
 
         try:
             # Skip the first row
-            df = pd.read_csv(file)
+            df = pd.read_csv(file, dtype=str)
             result = []
             for index, row in df.iterrows():
                 content = {"question": row.iloc[0], "answer": row.iloc[1]}