diff --git a/math/sum_of_binomial_coefficient.cpp b/math/sum_of_binomial_coefficient.cpp
index 1ed878b75..68ab0d5af 100644
--- a/math/sum_of_binomial_coefficient.cpp
+++ b/math/sum_of_binomial_coefficient.cpp
@@ -57,5 +57,5 @@ static void test()
 int main() 
 { 
     test(); // execute the tests
-	return 0; 
+    return 0;
 }