diff --git a/audio/deps/mp3/layer3.c b/audio/deps/mp3/layer3.c
index 11bcf8e..0b7c7dc 100644
--- a/audio/deps/mp3/layer3.c
+++ b/audio/deps/mp3/layer3.c
@@ -1566,7 +1566,7 @@ static void III_aliasreduce(mad_fixed_t xr[576], int lines)
 void III_imdct_l(mad_fixed_t const[18], mad_fixed_t[36], unsigned int);
 #else
 #if 1
-static void fastsdct(mad_fixed_t const x[9], mad_fixed_t y[18]) {
+static void fastsdct(mad_fixed_t const x[9], mad_fixed_t y[17]) {
     mad_fixed_t a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12;
     mad_fixed_t a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25;
     mad_fixed_t m0, m1, m2, m3, m4, m5, m6, m7;