diff --git a/libavcodec/opus/dec_celt.c b/libavcodec/opus/dec_celt.c
index 3feb4a4e47..a43d63d9db 100644
--- a/libavcodec/opus/dec_celt.c
+++ b/libavcodec/opus/dec_celt.c
@@ -463,6 +463,8 @@ int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc,
                                                   block->emph_coeff,
                                                   ff_opus_deemph_weights,
                                                   frame_size);
+        if (!isnormal(block->emph_coeff))
+            block->emph_coeff = 0.0;
     }
 
     if (channels == 1)