diff --git a/libavcodec/amrwbdec.c b/libavcodec/amrwbdec.c
index 4885c2d6a2..a90a27abe1 100644
--- a/libavcodec/amrwbdec.c
+++ b/libavcodec/amrwbdec.c
@@ -122,7 +122,7 @@ static int decode_mime_header(AMRWBContext *ctx, const uint8_t *buf)
 {
     /* Decode frame header (1st octet) */
     ctx->fr_cur_mode  = buf[0] >> 3 & 0x0F;
-    ctx->fr_quality   = (buf[0] & 0x4) != 0x4;
+    ctx->fr_quality   = (buf[0] & 0x4) == 0x4;
 
     return 1;
 }