diff --git a/src/main/java/cn/org/hentai/jtt1078/codec/G711Codec.java b/src/main/java/cn/org/hentai/jtt1078/codec/G711Codec.java
index 6a2a2177e3819002018efe1cf97c425ac0d274e6..a033b2678e5c37c1b0953cee29b07e623ea1013e 100644
--- a/src/main/java/cn/org/hentai/jtt1078/codec/G711Codec.java
+++ b/src/main/java/cn/org/hentai/jtt1078/codec/G711Codec.java
@@ -122,8 +122,8 @@ public class G711Codec extends AudioCodec
         // 如果前四字节是00 01 52 00，则是海思头，需要去掉
         if (data[0] == 0x00 && data[1] == 0x01 && (data[2] & 0xff) == (data.length - 4) / 2 && data[3] == 0x00)
         {
-            temp = new byte[data.length - 8];
-            System.arraycopy(data, 8, temp, 0, temp.length);
+            temp = new byte[data.length - 4];
+            System.arraycopy(data, 4, temp, 0, temp.length);
         }
         else temp = data;
 
diff --git a/src/main/java/cn/org/hentai/jtt1078/codec/G711UCodec.java b/src/main/java/cn/org/hentai/jtt1078/codec/G711UCodec.java
index 29d7199be749e0d14db097bd00efeaab739bc5c7..19f40e8c9df99daef90cd2907253d5afb745ec9f 100644
--- a/src/main/java/cn/org/hentai/jtt1078/codec/G711UCodec.java
+++ b/src/main/java/cn/org/hentai/jtt1078/codec/G711UCodec.java
@@ -185,8 +185,8 @@ public class G711UCodec extends AudioCodec
         // 如果前四字节是00 01 52 00，则是海思头，需要去掉
         if (data[0] == 0x00 && data[1] == 0x01 && (data[2] & 0xff) == (data.length - 4) / 2 && data[3] == 0x00)
         {
-            temp = new byte[data.length - 8];
-            System.arraycopy(data, 8, temp, 0, temp.length);
+            temp = new byte[data.length - 4];
+            System.arraycopy(data, 4, temp, 0, temp.length);
         }
         else temp = data;