diff --git a/celt/mdct.h b/celt/mdct.h
index 201f28b433c7ec2d49992aca370e9146b8b18596..d72182138ac2633d1bc32b408afa601d97230a8e 100644
--- a/celt/mdct.h
+++ b/celt/mdct.h
@@ -57,12 +57,14 @@ int clt_mdct_init(mdct_lookup *l,int N, int maxshift);
 void clt_mdct_clear(mdct_lookup *l);
 
 /** Compute a forward MDCT and scale by 4/N, trashes the input array */
-void clt_mdct_forward(const mdct_lookup *l, kiss_fft_scalar *in, kiss_fft_scalar *out,
+void clt_mdct_forward(const mdct_lookup *l, kiss_fft_scalar *in,
+      kiss_fft_scalar * OPUS_RESTRICT out,
       const opus_val16 *window, int overlap, int shift, int stride);
 
 /** Compute a backward MDCT (no scaling) and performs weighted overlap-add
     (scales implicitly by 1/2) */
-void clt_mdct_backward(const mdct_lookup *l, kiss_fft_scalar *in, kiss_fft_scalar *out,
+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);
 
 #endif
diff --git a/include/opus_custom.h b/include/opus_custom.h
index d4d33976f56b344ba1455346baea50bb8ea760d3..e7861d6f0a8127b1a59e7260452dc6255e0e2563 100644
--- a/include/opus_custom.h
+++ b/include/opus_custom.h
@@ -318,7 +318,7 @@ OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode(
   * by a convenience macro.
   * @see opus_genericctls
   */
-OPUS_CUSTOM_EXPORT int opus_custom_decoder_ctl(OpusCustomDecoder * restrict st, int request, ...) OPUS_ARG_NONNULL(1);
+OPUS_CUSTOM_EXPORT int opus_custom_decoder_ctl(OpusCustomDecoder * OPUS_RESTRICT st, int request, ...) OPUS_ARG_NONNULL(1);
 
 /**@}*/