diff --git a/mp3lib/dct64.c b/mp3lib/dct64.c
index 195921d233..38852ed382 100644
--- a/mp3lib/dct64.c
+++ b/mp3lib/dct64.c
@@ -310,7 +310,7 @@ static void dct64_1(real *out0,real *out1,real *b1,real *b2,real *samples)
  * the call via dct64 is a trick to force GCC to use
  * (new) registers for the b1,b2 pointer to the bufs[xx] field
  */
-void dct64(real *a,real *b,real *c)
+static void dct64(real *a,real *b,real *c)
 {
   real bufs[0x40];
   dct64_1(a,b,bufs,bufs+0x20,c);
diff --git a/mp3lib/mpg123.h b/mp3lib/mpg123.h
index c317901d65..787eceaa51 100644
--- a/mp3lib/mpg123.h
+++ b/mp3lib/mpg123.h
@@ -120,7 +120,6 @@ extern int synth_1to1_pent( real *,int,short * );
 extern void make_decode_tables_MMX(long scaleval);
 extern int synth_1to1_MMX( real *,int,short * );
 extern int synth_1to1_MMX_s(real *, int, short *, short *, int *);
-extern void dct64(real *a,real *b,real *c);
 
 extern void dct36_3dnow(real *,real *,real *,real *,real *);
 extern void dct36_3dnowex(real *,real *,real *,real *,real *);