diff --git a/helper/exercises.py b/helper/exercises.py
index bdf952e..2108d11 100644
--- a/helper/exercises.py
+++ b/helper/exercises.py
@@ -155,10 +155,12 @@ def build_write_blanks_solutions(questions: [], start_id):
 def build_write_blanks_solutions_listening(words: [], start_id):
     solutions = []
     for i, word in enumerate(words, start=start_id):
+        solution = [word] if isinstance(word, str) else word
+
         solutions.append(
             {
                 "id": str(i),
-                "solution": word
+                "solution": solution
             }
         )
     return solutions