diff --git a/src/textbooks/techniques-in-computer-science/variables/Chapter.md b/src/textbooks/techniques-in-computer-science/variables/Chapter.md
index a7088f9..aa640ee 100644
--- a/src/textbooks/techniques-in-computer-science/variables/Chapter.md
+++ b/src/textbooks/techniques-in-computer-science/variables/Chapter.md
@@ -425,7 +425,7 @@ Now we can proceed to calculate the remaining Fibonacci numbers, according to th
 >>> fib_11 = fib_10 + fib_9
 >>> fib_12 = fib_11 + fib_10
 >>> fib_13 = fib_12 + fib_11
->>> fib_14 = fib_13 + fib_13
+>>> fib_14 = fib_13 + fib_12
 >>> fib_14
 377
 ```