diff --git a/crypto_lib.cpp b/crypto_lib.hpp
similarity index 100%
rename from crypto_lib.cpp
rename to crypto_lib.hpp
diff --git a/example.cpp b/example.cpp
index 6006cc9..6667ee9 100644
--- a/example.cpp
+++ b/example.cpp
@@ -1,4 +1,4 @@
-#include "crypto_lib.cpp"
+#include "crypto_lib.hpp"
 #include <iostream>
 #include <vector>
 #include <string>