diff --git a/libs/vkd3d-shader/d3dbc.c b/libs/vkd3d-shader/d3dbc.c
index abfbd461..e4b501c6 100644
--- a/libs/vkd3d-shader/d3dbc.c
+++ b/libs/vkd3d-shader/d3dbc.c
@@ -2499,6 +2499,10 @@ static void d3dbc_write_expr(struct d3dbc_compiler *d3dbc, const struct hlsl_ir_
             d3dbc_write_dp2add(d3dbc, &instr->reg, &arg1->reg, &arg2->reg, &arg3->reg);
             break;
 
+        case HLSL_OP3_MAD:
+            d3dbc_write_ternary_op(d3dbc, D3DSIO_MAD, &instr->reg, &arg1->reg, &arg2->reg, &arg3->reg);
+            break;
+
         default:
             hlsl_fixme(ctx, &instr->loc, "SM1 \"%s\" expression.", debug_hlsl_expr_op(expr->op));
             break;