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diff --git a/examples/fib_tc.fco b/examples/fib_tc.fco
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--- /dev/null
+++ b/examples/fib_tc.fco
@@ -0,0 +1,19 @@
+# fibonacci number with tail call optimization
+def fib(n)
+    def fibrec(n acc1 acc2)
+        if =(n 0)
+            acc1
+        elif =(n 1)
+            acc2
+        else
+            @fibrec(-(n 1) acc2 +(acc1 acc2))
+        end
+    end
+
+    fibrec(90 0 1)
+end
+
+def main()
+    display("Running fib(90)...")
+    display(fib(90))
+end