diff --git a/enhancer/data/fileprocessor.py b/enhancer/data/fileprocessor.py
index 66d4d75..03afc73 100644
--- a/enhancer/data/fileprocessor.py
+++ b/enhancer/data/fileprocessor.py
@@ -98,6 +98,10 @@ class Fileprocessor:
                 return cls(clean_dir, noisy_dir, ProcessorFunctions.one_to_one)
             elif name.lower() == "dns-2020":
                 return cls(clean_dir, noisy_dir, ProcessorFunctions.one_to_many)
+            else:
+                raise ValueError(
+                    f"Invalid matching function, Please use valid matching function from {MATCHING_FNS}"
+                )
         else:
             if matching_function not in MATCHING_FNS:
                 raise ValueError(
diff --git a/enhancer/inference.py b/enhancer/inference.py
index ae399f1..fd3b518 100644
--- a/enhancer/inference.py
+++ b/enhancer/inference.py
@@ -91,7 +91,7 @@ class Inference:
         window_size: int,
         total_frames: int,
         step_size: Optional[int] = None,
-        window="hanning",
+        window="hamming",
     ):
         """
         stitch batched waveform into single waveform. (Overlap-add)