diff --git a/alu.sv b/alu.sv
index 44881e8..e8ceece 100644
--- a/alu.sv
+++ b/alu.sv
@@ -14,7 +14,7 @@ module alu(
     int cnt;
 
     initial begin
-        overflow = 1'bx;
+        overflow = 0;
         result = 8'hxx;
         result_int = 9'bxxxxxxxxx;
         done = 0;
@@ -24,7 +24,7 @@ module alu(
     always_ff @(posedge clk_in) begin
         if (rst_in) begin
             done <= 0;        
-            overflow <= 1'bx;
+            overflow <= 0;
             result <= 8'hxx;
             result_int <= 9'bxxxxxxxxx;
             cnt <= 0;
@@ -65,14 +65,17 @@ module alu(
                 end
                 structs::OR: begin
                     result <= in.operand_a | in.operand_b; 
+                    overflow <= 0;
                     done <= 1;
                 end
                 structs::AND: begin
                     result <= in.operand_a & in.operand_b; 
+                    overflow <= 0;
                     done <= 1;
                 end
                 structs::XOR: begin
                     result <= in.operand_a ^ in.operand_b; 
+                    overflow <= 0;
                     done <= 1;
                 end
                 structs::SHR: begin
diff --git a/cpu.sv b/cpu.sv
index e685718..aa01b86 100644
--- a/cpu.sv
+++ b/cpu.sv
@@ -264,7 +264,7 @@ logic [5:0] lcd_led;
                     instr.alu_i.op <= structs::OR;
                     instr.alu_i.operand_a <= registers[opcode[7:4]];
                     instr.alu_i.operand_b <= registers[opcode[11:8]];
-                    compute_of <= 0;
+                    compute_of <= 1;
 
                     state <= ST_EXEC;
                 end
@@ -279,7 +279,7 @@ logic [5:0] lcd_led;
                     instr.alu_i.op <= structs::AND;
                     instr.alu_i.operand_a <= registers[opcode[7:4]];
                     instr.alu_i.operand_b <= registers[opcode[11:8]];
-                    compute_of <= 0;
+                    compute_of <= 1;
 
                     state <= ST_EXEC;
                 end
@@ -294,7 +294,7 @@ logic [5:0] lcd_led;
                     instr.alu_i.op <= structs::XOR;
                     instr.alu_i.operand_a <= registers[opcode[7:4]];
                     instr.alu_i.operand_b <= registers[opcode[11:8]];
-                    compute_of <= 0;
+                    compute_of <= 1;
 
                     state <= ST_EXEC;
                 end
@@ -620,8 +620,12 @@ logic [5:0] lcd_led;
                         instr.src <= BYTE;
                         if (instr.dst == IDX_REG) 
                             instr.src_byte <= alu_result_long[11:0];
-                        else 
+                        else if (instr.dst_reg != 15 || !compute_of) begin 
                             instr.src_byte <= alu_result;
+                        end else begin
+                            instr.src_byte <= alu_overflow;
+                        end
+
                         registers[15] <= compute_of ? alu_overflow : registers[15];
                         if (instr.op == ALU) begin
                             state <= ST_WB;