diff --git a/app.py b/app.py
index 9d3146f..bfa9bd8 100644
--- a/app.py
+++ b/app.py
@@ -25,7 +25,7 @@ def convert_to_wav(file_name: str):
     command = [
         "tape2wav",
         os.path.join("uploads", file_name),
-        os.path.join("uploads", f"${output}.wav"),
+        os.path.join("uploads", f"{output}.wav"),
     ]
     try:
         check_call(command)