diff --git a/libavcodec/x86/vc1dsp_mmx.c b/libavcodec/x86/vc1dsp_mmx.c
index 4e996f1ce6..717f74f287 100644
--- a/libavcodec/x86/vc1dsp_mmx.c
+++ b/libavcodec/x86/vc1dsp_mmx.c
@@ -797,7 +797,7 @@ void ff_vc1dsp_init_mmx(VC1DSPContext *dsp)
     if (mm_flags & AV_CPU_FLAG_MMX) {
         dsp->put_no_rnd_vc1_chroma_pixels_tab[0]= ff_put_vc1_chroma_mc8_mmx_nornd;
     }
-    return;
+
     if (mm_flags & AV_CPU_FLAG_MMX2) {
         ASSIGN_LF(mmx2);
         dsp->avg_no_rnd_vc1_chroma_pixels_tab[0]= ff_avg_vc1_chroma_mc8_mmx2_nornd;
diff --git a/libavcodec/x86/vc1dsp_yasm.asm b/libavcodec/x86/vc1dsp_yasm.asm
index 2c5cf22a0a..ced2b5ba88 100644
--- a/libavcodec/x86/vc1dsp_yasm.asm
+++ b/libavcodec/x86/vc1dsp_yasm.asm
@@ -119,7 +119,9 @@ section .text
     pand    m2, m6
     pand    m3, m2  ; d final
 
-    PSIGNW  m3, m7
+    psraw   m7, 15
+    pxor    m3, m7
+    psubw   m3, m7
     psubw   m0, m3
     paddw   m1, m3
     packuswb m0, m0
@@ -284,7 +286,6 @@ cglobal vc1_h_loop_filter8_sse2, 3,6,8
     RET
 
 %define PABSW PABSW_SSSE3
-%define PSIGNW PSIGNW_SSSE3
 
 INIT_MMX
 ; void ff_vc1_v_loop_filter4_ssse3(uint8_t *src, int stride, int pq)