diff --git a/bin/import_lingua_libre.py b/bin/import_lingua_libre.py
index 3a27a7dd..5b126406 100644
--- a/bin/import_lingua_libre.py
+++ b/bin/import_lingua_libre.py
@@ -91,6 +91,7 @@ def _maybe_convert_sets(target_dir, extracted_data):
         wav_filename = path.splitext(ogg_filename)[0] + ".wav"
         _maybe_convert_wav(ogg_filename, wav_filename)
         file_size = -1
+        frames = 0
         if path.exists(wav_filename):
             file_size = path.getsize(wav_filename)
             frames = int(subprocess.check_output(['soxi', '-s', wav_filename], stderr=subprocess.STDOUT))
diff --git a/bin/import_ts.py b/bin/import_ts.py
index 235c052e..6ff10426 100755
--- a/bin/import_ts.py
+++ b/bin/import_ts.py
@@ -89,6 +89,7 @@ def _maybe_convert_sets(target_dir, extracted_data, english_compatible=False):
         wav_filename = path.splitext(orig_filename)[0] + ".converted.wav"
         _maybe_convert_wav(orig_filename, wav_filename)
         file_size = -1
+        frames = 0
         if path.exists(wav_filename):
             file_size = path.getsize(wav_filename)
             frames = int(subprocess.check_output(['soxi', '-s', wav_filename], stderr=subprocess.STDOUT))