diff --git a/arch/linux/tui/main.c b/arch/linux/tui/main.c
index 0e103fb..f0d85fb 100644
--- a/arch/linux/tui/main.c
+++ b/arch/linux/tui/main.c
@@ -50,33 +50,42 @@ void test_add_two_num() {
 }
 
 void test_fibonacci() {
-  /* fn main() */
+  i32 fib = 6;
+  i32 base_case = 20;
+  /* function main() */
   i32 main_local_count = 3; 
   mp += (4 * main_local_count);
+  /* fib(35) */
   code[cp++] = ENCODE_B(OP_LOAD_IMM, 0, 35);
   code[cp++] = ENCODE_B(OP_PUSH, 0, 0);
-  i32 fib = cp + 4;
   code[cp++] = ENCODE_B(OP_LOAD_IMM, 1, fib);
-  code[cp++] = ENCODE_A(OP_CALL, 1, 3, 2);
+  code[cp++] = ENCODE_A(OP_CALL, 1, 9, 2);
+  /* print */
   code[cp++] = ENCODE_A(OP_SYSCALL, SYSCALL_DBG_PRINT, 1, 2);
   code[cp++] = ENCODE_A(OP_HALT, 0, 0, 0);
-
-  /* fn fib */
+  /* function fib (int n) int */
+  code[cp++] = ENCODE_B(OP_LOAD_IMM, 8, fib);
   code[cp++] = ENCODE_B(OP_LOAD_IMM, 1, 2);
-  code[cp++] = ENCODE_B(OP_LOAD_IMM, 2, fib);
+  code[cp++] = ENCODE_B(OP_LOAD_IMM, 2, base_case);
   code[cp++] = ENCODE_A(OP_JLT_INT, 2, 0, 1);
   code[cp++] = ENCODE_B(OP_LOAD_IMM, 3, 2);
   code[cp++] = ENCODE_A(OP_SUB_INT, 4, 0, 3);
   code[cp++] = ENCODE_B(OP_PUSH, 4, 0);
-  code[cp++] = ENCODE_A(OP_CALL, 2, 3, 2);
-
+  code[cp++] = ENCODE_A(OP_CALL, 8, 9, 5);
+  code[cp++] = ENCODE_B(OP_LOAD_IMM, 3, 1);
+  code[cp++] = ENCODE_A(OP_SUB_INT, 4, 0, 3);
+  code[cp++] = ENCODE_B(OP_PUSH, 4, 0);
+  code[cp++] = ENCODE_A(OP_CALL, 8, 9, 6);
+  code[cp++] = ENCODE_A(OP_ADD_INT, 7, 6, 5);
+  code[cp++] = ENCODE_B(OP_RETURN, 7, 0);
   code[cp++] = ENCODE_B(OP_RETURN, 0, 0);
 }
 
 i32 main() {
   init_vm();
 
-  test_add_two_num();
+  /* test_add_two_num(); */
+  test_fibonacci();
 
   while(step_vm()) {
     // do stuff