diff --git a/rc_add_sub_32.v b/rc_add_sub_32.v
index 86cf55b..5418e4f 100644
--- a/rc_add_sub_32.v
+++ b/rc_add_sub_32.v
@@ -37,7 +37,9 @@ genvar i;
 generate
     for (i = 0; i < 64; i = i + 1)
     begin : add64_gen_loop
-        FULL_ADDER add64_inst(Y[i], C[i+1], A[i], B[i] ^ SnA, C[i]);
+        wire B_xor;
+        xor (B_xor, B[i], SnA);
+        FULL_ADDER add64_inst(Y[i], C[i+1], A[i], B_xor, C[i]);
     end
 endgenerate
 
@@ -62,7 +64,9 @@ genvar i;
 generate
     for (i = 0; i < 32; i = i + 1)
     begin : add32_gen_loop
-        FULL_ADDER add32_inst(Y[i], C[i+1], A[i], B[i] ^ SnA, C[i]);
+        wire B_xor;
+        xor (B_xor, B[i], SnA);
+        FULL_ADDER add32_inst(Y[i], C[i+1], A[i], B_xor, C[i]);
     end
 endgenerate