diff --git a/assembler/packed_yuv_sf.g4a b/assembler/packed_yuv_sf.g4a
index 0e37782f..8c1398f4 100644
--- a/assembler/packed_yuv_sf.g4a
+++ b/assembler/packed_yuv_sf.g4a
@@ -1,6 +1,6 @@
 send (1) 0 g6<1>F g1.12<0,1,0>F math inv scalar mlen 1 rlen 1 { align1 };
 send (1) 0 g6.4<1>F g1.20<0,1,0>F math inv scalar mlen 1 rlen 1 { align1 };
-add (8) g7<1>F g4<8,8,1>F g3<8,8,1>F { align1 };
+add (8) g7<1>F g4<8,8,1>F -g3<8,8,1>F { align1 };
 mul (1) g7<1>F g7<0,1,0>F g6<0,1,0>F { align1 };
 mul (1) g7.4<1>F g7.4<0,1,0>F g6.4<0,1,0>F { align1 };
 mov (8) m1<1>F g7<0,1,0>F { align1 };