diff --git a/others/palindrome_of_number.cpp b/others/palindrome_of_number.cpp
index dda872882..93c54a965 100644
--- a/others/palindrome_of_number.cpp
+++ b/others/palindrome_of_number.cpp
@@ -1,4 +1,5 @@
 #include <algorithm>
+#include <cstring>
 #include <iostream>
 
 int main() {