diff --git a/timercpp.h b/timercpp.h
index 46d3226..74a44e0 100644
--- a/timercpp.h
+++ b/timercpp.h
@@ -1,3 +1,6 @@
+#ifndef __99XT_TIMERCPP
+#define __99XT_TIMERCPP
+
 #include <iostream>
 #include <thread>
 #include <chrono>
@@ -5,37 +8,34 @@
 class Timer {
     bool clear = false;
 
-    public:
-        void setTimeout(auto function, int delay);
-        void setInterval(auto function, int interval);
-        void stop();
-
-};
-
-void Timer::setTimeout(auto function, int delay) {
-    this->clear = false;
-    std::thread t([=]() {
-        if(this->clear) return;
-        std::this_thread::sleep_for(std::chrono::milliseconds(delay));
-        if(this->clear) return;
-        function();
-    });
-    t.detach();
-}
-
-void Timer::setInterval(auto function, int interval) {
-    this->clear = false;
-    std::thread t([=]() {
-        while(true) {
+public:
+    void setTimeout(auto function, int delay) {
+        this->clear = false;
+        std::thread t([=]() {
             if(this->clear) return;
-            std::this_thread::sleep_for(std::chrono::milliseconds(interval));
+                std::this_thread::sleep_for(std::chrono::milliseconds(delay));
             if(this->clear) return;
-            function();
-        }
-    });
-    t.detach();
-}
+                function();
+        });
+        t.detach();
+    }
+
+    void setInterval(auto function, int interval) {
+        this->clear = false;
+        std::thread t([=]() {
+            while(true) {
+                if(this->clear) return;
+                    std::this_thread::sleep_for(std::chrono::milliseconds(interval));
+                if(this->clear) return;
+                    function();
+            }
+        });
+        t.detach();
+    }
+
+    void stop() {
+        this->clear = true;
+    }
+};
 
-void Timer::stop() {
-    this->clear = true;
-}
\ No newline at end of file
+#endif // __99XT_TIMERCPP