diff --git a/media/libvpx/vp9/encoder/x86/vp9_quantize_ssse3_x86_64.asm b/media/libvpx/vp9/encoder/x86/vp9_quantize_ssse3_x86_64.asm
index 449d52b22..9ee55a382 100644
--- a/media/libvpx/vp9/encoder/x86/vp9_quantize_ssse3_x86_64.asm
+++ b/media/libvpx/vp9/encoder/x86/vp9_quantize_ssse3_x86_64.asm
@@ -186,7 +186,7 @@ cglobal quantize_%1, 0, %2, 15, coeff, ncoeff, skip, zbin, round, quant, \
   pshuflw                         m7, m8, 0x1
   pmaxsw                          m8, m7
   pextrw                          r6, m8, 0
-  mov                             [r2], r6
+  mov                             [r2], r6w
   RET
 
   ; skip-block, i.e. just write all zeroes