diff --git a/src/opus_multistream_encoder.c b/src/opus_multistream_encoder.c
index 31447bf..01ed30f 100644
--- a/src/opus_multistream_encoder.c
+++ b/src/opus_multistream_encoder.c
@@ -232,6 +232,7 @@
    VARDECL(opus_val32, in);
    VARDECL(opus_val16, x);
    VARDECL(opus_val32, out);
+   VARDECL(opus_val32, freq);
    SAVE_STACK;
 
    upsample = resampling_factor(rate);