diff --git a/tests/fate-run.sh b/tests/fate-run.sh
index ef9c7ef064..c61a4dc992 100755
--- a/tests/fate-run.sh
+++ b/tests/fate-run.sh
@@ -513,7 +513,7 @@ pixfmt_conversion_ext(){
     outdir="tests/data/pixfmt"
     file=${outdir}/${color_range}-${conversion}.yuv
     cleanfiles="$cleanfiles $file"
-    do_avconv $file $DEC_OPTS -lavfi ${prefix}testsrc=s=352x288,format=${color_range},scale=flags=$SCALE_FLAGS,format=$conversion \
+    do_avconv $file $DEC_OPTS -lavfi ${prefix}testsrc=s=352x288,format=${color_range},scale=flags=$SCALE_FLAGS:sws_dither=none,format=$conversion \
               $ENC_OPTS -t 1 -f rawvideo -s 352x288 -pix_fmt ${color_range}${suffix} -color_range mpeg
 }
 
diff --git a/tests/ref/pixfmt/yuv444p10-yuv444p b/tests/ref/pixfmt/yuv444p10-yuv444p
index c39314523a..44cd8a40a6 100644
--- a/tests/ref/pixfmt/yuv444p10-yuv444p
+++ b/tests/ref/pixfmt/yuv444p10-yuv444p
@@ -1,2 +1,2 @@
-67d5749f3b40b343008f9a62db1b2abd *tests/data/pixfmt/yuv444p10-yuv444p.yuv
+1b783c5b90f43945b91b0b5be254aded *tests/data/pixfmt/yuv444p10-yuv444p.yuv
 15206400 tests/data/pixfmt/yuv444p10-yuv444p.yuv
diff --git a/tests/ref/pixfmt/yuv444p12-yuv444p b/tests/ref/pixfmt/yuv444p12-yuv444p
index a59328f3c0..fc5e8e53ad 100644
--- a/tests/ref/pixfmt/yuv444p12-yuv444p
+++ b/tests/ref/pixfmt/yuv444p12-yuv444p
@@ -1,2 +1,2 @@
-1ece60e7894b113b09c86575c66a2ec8 *tests/data/pixfmt/yuv444p12-yuv444p.yuv
+9339fb7fd327f4131639c3b718eeccce *tests/data/pixfmt/yuv444p12-yuv444p.yuv
 15206400 tests/data/pixfmt/yuv444p12-yuv444p.yuv
diff --git a/tests/ref/pixfmt/yuv444p12-yuv444p10be b/tests/ref/pixfmt/yuv444p12-yuv444p10be
index 90740e0467..9785443799 100644
--- a/tests/ref/pixfmt/yuv444p12-yuv444p10be
+++ b/tests/ref/pixfmt/yuv444p12-yuv444p10be
@@ -1,2 +1,2 @@
-284113a13f5c2378e87ff5e53aff23cb *tests/data/pixfmt/yuv444p12-yuv444p10be.yuv
+6f9fb7022d197765457c7a39645d8a3f *tests/data/pixfmt/yuv444p12-yuv444p10be.yuv
 15206400 tests/data/pixfmt/yuv444p12-yuv444p10be.yuv
diff --git a/tests/ref/pixfmt/yuv444p12-yuv444p10le b/tests/ref/pixfmt/yuv444p12-yuv444p10le
index 317094ed20..829a350417 100644
--- a/tests/ref/pixfmt/yuv444p12-yuv444p10le
+++ b/tests/ref/pixfmt/yuv444p12-yuv444p10le
@@ -1,2 +1,2 @@
-284113a13f5c2378e87ff5e53aff23cb *tests/data/pixfmt/yuv444p12-yuv444p10le.yuv
+6f9fb7022d197765457c7a39645d8a3f *tests/data/pixfmt/yuv444p12-yuv444p10le.yuv
 15206400 tests/data/pixfmt/yuv444p12-yuv444p10le.yuv