diff --git a/src/intel/compiler/brw_fs_nir.cpp b/src/intel/compiler/brw_fs_nir.cpp
index 1a15c0d9561..f1a635c4fd4 100644
--- a/src/intel/compiler/brw_fs_nir.cpp
+++ b/src/intel/compiler/brw_fs_nir.cpp
@@ -562,17 +562,16 @@ fs_visitor::optimize_frontfacing_ternary(nir_alu_instr *instr,
 
       /* For (gl_FrontFacing ? 1.0 : -1.0), emit:
        *
-       *    or(8)  tmp.1<2>W  g0.0<0,1,0>W  0x00003f80W
+       *    or(8)  tmp.1<2>W  g1.1<0,1,0>W  0x00003f80W
        *    and(8) dst<1>D    tmp<8,8,1>D   0xbf800000D
        *
-       * and negate the result for (gl_FrontFacing ? -1.0 : 1.0).
+       * and negate g1.1<0,1,0>W for (gl_FrontFacing ? -1.0 : 1.0).
        */
+      if (value1 == -1.0f)
+         g1.negate = true;
+
       bld.OR(subscript(tmp, BRW_REGISTER_TYPE_W, 1),
              g1, brw_imm_uw(0x3f80));
-
-      if (value1 == -1.0f)
-         bld.MOV(tmp, negate(tmp));
-
    } else if (devinfo->ver >= 6) {
       /* Bit 15 of g0.0 is 0 if the polygon is front facing. */
       fs_reg g0 = fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_W));