diff --git a/lib/rbcodec/codecs/libopus/celt/kiss_fft.h b/lib/rbcodec/codecs/libopus/celt/kiss_fft.h
index 66332e3bb9..c6bb4bfd45 100644
--- a/lib/rbcodec/codecs/libopus/celt/kiss_fft.h
+++ b/lib/rbcodec/codecs/libopus/celt/kiss_fft.h
@@ -128,7 +128,7 @@ kiss_fft_state *opus_fft_alloc(int nfft,void * mem,size_t * lenmem);
     f[k].r and f[k].i
  * */
 void opus_fft(const kiss_fft_state *cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout);
-void opus_ifft(const kiss_fft_state *cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout);
+void opus_ifft(const kiss_fft_state *cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout) ICODE_ATTR;
 
 void opus_fft_free(const kiss_fft_state *cfg);
 
diff --git a/lib/rbcodec/codecs/libopus/celt/mdct.h b/lib/rbcodec/codecs/libopus/celt/mdct.h
index d72182138a..1abc1d17f7 100644
--- a/lib/rbcodec/codecs/libopus/celt/mdct.h
+++ b/lib/rbcodec/codecs/libopus/celt/mdct.h
@@ -65,6 +65,6 @@ void clt_mdct_forward(const mdct_lookup *l, kiss_fft_scalar *in,
     (scales implicitly by 1/2) */
 void clt_mdct_backward(const mdct_lookup *l, kiss_fft_scalar *in,
       kiss_fft_scalar * OPUS_RESTRICT out,
-      const opus_val16 * OPUS_RESTRICT window, int overlap, int shift, int stride);
+      const opus_val16 * OPUS_RESTRICT window, int overlap, int shift, int stride) ICODE_ATTR;
 
 #endif