diff --git a/tests/opt/opt_expr_xor_assignment.ys b/tests/opt/opt_expr_xor_assignment.ys
new file mode 100644
index 000000000..924185e09
--- /dev/null
+++ b/tests/opt/opt_expr_xor_assignment.ys
@@ -0,0 +1,15 @@
+read_verilog -sv <<EOT
+module opt_expr_xor_test(input [3:0] i, input [7:0] j, output [8:0] o);
+wire[8:0] a = 8'b0;
+initial begin
+	a ^= i;
+	a ^= j;
+end
+    assign o = a;
+endmodule
+EOT
+proc
+equiv_opt -assert opt_expr -fine
+design -load postopt
+
+select -assert-count 1 t:$xor r:A_WIDTH=4 r:B_WIDTH=4 r:Y_WIDTH=4 %i %i %i