diff --git a/libavformat/nutenc.c b/libavformat/nutenc.c
index a8a431fc22..51c7633ae7 100644
--- a/libavformat/nutenc.c
+++ b/libavformat/nutenc.c
@@ -462,7 +462,7 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt){
     if(1LL<<(20+3*nut->header_count) <= url_ftell(bc))
         write_headers(nut, bc);
 
-    if(key_frame && !!(nus->last_flags & FLAG_KEY))
+    if(key_frame && !(nus->last_flags & FLAG_KEY))
         store_sp= 1;
 
     if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
diff --git a/tests/libav.regression.ref b/tests/libav.regression.ref
index ac69ea1932..fba7ed4daa 100644
--- a/tests/libav.regression.ref
+++ b/tests/libav.regression.ref
@@ -30,8 +30,8 @@ f8ad5bd78f4d012a8ce9570aa395ac54 *./tests/data/b-libav.flv
 2ba41cf880aa5cb87e8a08fdb735398d *./tests/data/b-libav.gxf
 814640 ./tests/data/b-libav.gxf
 ./tests/data/b-libav.gxf CRC=0xa376c09e
-5b6d03cfa8ccb701bec3c0f0e562e0da *./tests/data/b-libav.nut
-330100 ./tests/data/b-libav.nut
+5489961f19ae94683d134d8108d646c8 *./tests/data/b-libav.nut
+329785 ./tests/data/b-libav.nut
 ./tests/data/b-libav.nut CRC=0x400c29e9
 43238b15f1012aa27536c2be20bb2383 *./tests/data/b-libav.mkv
 329854 ./tests/data/b-libav.mkv