diff --git a/Manifest.txt b/Manifest.txt
index 791024e..2bf5c7b 100644
--- a/Manifest.txt
+++ b/Manifest.txt
@@ -21,8 +21,6 @@ ext/icanhasaudio/native.c
 ext/icanhasaudio/native.h
 ext/icanhasaudio/rb_wav.c
 ext/icanhasaudio/rb_wav.h
-ext/icanhasaudio/syncword.c
-ext/icanhasaudio/syncword.h
 lib/icanhasaudio.rb
 lib/icanhasaudio/mpeg.rb
 lib/icanhasaudio/mpeg/decoder.rb
diff --git a/ext/icanhasaudio/native.h b/ext/icanhasaudio/native.h
index ab5a0e2..85606d9 100644
--- a/ext/icanhasaudio/native.h
+++ b/ext/icanhasaudio/native.h
@@ -9,7 +9,6 @@
 #include <ogg/ogg.h>
 #include <vorbis/vorbisfile.h>
 
-#include <syncword.h>
 #include <get_audio.h>
 #include <rb_wav.h>
 #include <audio_mpeg_decoder.h>
diff --git a/ext/icanhasaudio/syncword.c b/ext/icanhasaudio/syncword.c
deleted file mode 100644
index 934a9e5..0000000
--- a/ext/icanhasaudio/syncword.c
+++ /dev/null
@@ -1,47 +0,0 @@
-#include <native.h>
-
-/*
- * Taken from lame, get_audio.c
- */
-
-int is_syncword_mp123(const void *const headerptr)
-{
-    const unsigned char *const p = headerptr;
-    static const char abl2[16] =
-        { 0, 7, 7, 7, 0, 7, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8 };
-
-    if ((p[0] & 0xFF) != 0xFF)
-        return 0;       /* first 8 bits must be '1' */
-    if ((p[1] & 0xE0) != 0xE0)
-        return 0;       /* next 3 bits are also */
-    if ((p[1] & 0x18) == 0x08)
-        return 0;       /* no MPEG-1, -2 or -2.5 */        
-    if ((p[1] & 0x06) == 0x00)
-        return 0;       /* no Layer I, II and III */
-#ifndef USE_LAYER_1
-    if ((p[1] & 0x06) == 0x03*2)
-	return 0; /* layer1 is not supported */
-#endif
-#ifndef USE_LAYER_2
-    if ((p[1] & 0x06) == 0x02*2)
-	return 0; /* layer1 is not supported */
-#endif
-    /*
-    if (!(((p[1] & 0x06) == 0x03*2 && input_format == sf_mp1)
-	  || ((p[1] & 0x06) == 0x02*2 && input_format == sf_mp2)
-	  || ((p[1] & 0x06) == 0x01*2 && input_format == sf_mp3)))
-    */
-	  if(!(p[1] & 0x06) == 0x01*2)
-	return 0; /* imcompatible layer with input file format */
-    if ((p[2] & 0xF0) == 0xF0)
-        return 0;       /* bad bitrate */
-    if ((p[2] & 0x0C) == 0x0C)
-        return 0;       /* no sample frequency with (32,44.1,48)/(1,2,4)     */
-    if ((p[1] & 0x18) == 0x18 && (p[1] & 0x06) == 0x04
-	&& abl2[p[2] >> 4] & (1 << (p[3] >> 6)))
-	return 0;
-    if ((p[3] & 3) == 2)
-	return 0;       /* reserved enphasis mode */
-    return 1;
-}
-
diff --git a/ext/icanhasaudio/syncword.h b/ext/icanhasaudio/syncword.h
deleted file mode 100644
index 5508f0d..0000000
--- a/ext/icanhasaudio/syncword.h
+++ /dev/null
@@ -1,8 +0,0 @@
-#ifndef ICANHASAUDIO_SYNCWORD
-#define ICANHASAUDIO_SYNCWORD
-
-#include <native.h>
-
-int is_syncword_mp123(const void *const headerptr);
-
-#endif