diff --git a/include/add.hpp b/include/add.hpp
index 1688738..3ece510 100644
--- a/include/add.hpp
+++ b/include/add.hpp
@@ -1,7 +1,7 @@
 #ifndef ADD_H
 #define ADD_H
 
-int add(int i, int j){
+inline int add(int i, int j){
     return i+j;
 }