diff --git a/math/armstrong_number.cpp b/math/armstrong_number.cpp
index 3b7e67cc5..f8c7510e8 100644
--- a/math/armstrong_number.cpp
+++ b/math/armstrong_number.cpp
@@ -7,9 +7,9 @@
  * is a number that is the sum of its own digits raised to the power of the number of digits.
  * @author iamnambiar
 */
-#include<cassert>
-#include<iostream>
-#include<cmath>
+#include <cassert>
+#include <iostream>
+#include <cmath>
 
 /**
  * Function to calculate the total number of digits in the number.