diff --git a/math/double_factorial.cpp b/math/double_factorial.cpp
index db22cc672..72feda60c 100644
--- a/math/double_factorial.cpp
+++ b/math/double_factorial.cpp
@@ -61,7 +61,7 @@ void tests() {
     std::cout << "passed\n";
 }
 
-/** 
+/**
  * Main function
  */
 int main() {