diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c
index 921f322c4a..eef72c525c 100644
--- a/libavcodec/qdm2.c
+++ b/libavcodec/qdm2.c
@@ -822,7 +822,8 @@ static int synthfilt_build_sb_samples(QDM2Context *q, GetBitContext *gb,
     int type34_first;
     float type34_div = 0;
     float type34_predictor;
-    float samples[10], sign_bits[16];
+    float samples[10];
+    int sign_bits[16];
 
     if (length == 0) {
         // If no data use noise