diff --git a/libavcodec/flacdec.c b/libavcodec/flacdec.c
index d8ba07bc1d..d6e0c8620f 100644
--- a/libavcodec/flacdec.c
+++ b/libavcodec/flacdec.c
@@ -276,7 +276,7 @@ static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
 {
     const int blocksize = s->blocksize;
     int32_t *decoded = s->decoded[channel];
-    int a, b, c, d, i;
+    int av_uninit(a), av_uninit(b), av_uninit(c), av_uninit(d), i;
 
     /* warm up samples */
     for (i = 0; i < pred_order; i++) {