diff --git a/math/finding_number_of_Digits_in_a_Number.cpp b/math/finding_number_of_Digits_in_a_Number.cpp
index 99b3d967e..c0acd5c6a 100644
--- a/math/finding_number_of_Digits_in_a_Number.cpp
+++ b/math/finding_number_of_Digits_in_a_Number.cpp
@@ -19,7 +19,7 @@
  * @brief Main function
  * @returns 0 on exit
  */
-int main() {
+int main(void) {
     /* Initialize 'n' & 'count' by 0 */
     int n = 0;
     int count = 0;