diff --git a/opentone/__init__.py b/opentone/__init__.py
index d7e3ceb..a1c2112 100644
--- a/opentone/__init__.py
+++ b/opentone/__init__.py
@@ -60,7 +60,7 @@ def _save_wave_file(self, raw_data, file_path):
         f.setnframes(len(raw_data))
         f.setcomptype(self.COMPRESSION_TYPE, self.COMPRESSION_NAME)
         for i in raw_data:
-            f.writeframes(struct.pack('i', i))
+            f.writeframes(struct.pack('h', i))
         f.close()
 
     def _get_silence(self, duration_in_ms=None):