diff --git a/src/engine/engine.c b/src/engine/engine.c
index 9c58b76..b0ae430 100644
--- a/src/engine/engine.c
+++ b/src/engine/engine.c
@@ -11,6 +11,9 @@
 #include "arc/std/errno.h"
 #include "arc/std/handler.h"
 
+//TODO: remove this
+#include <SDL.h>
+
 void ARC_EngineData_Create(ARC_EngineData **data, ARC_Handler_CleanDataFn cleanFn, ARC_Point windowSize){
     *data = (ARC_EngineData *)malloc(sizeof(ARC_EngineData));
     (*data)->window   = NULL;
@@ -58,13 +61,13 @@ void ARC_Engine_RunUncapped(ARC_EngineData *data){
         return;
     }
 
-    // double lastTime = 0, currentTime;
+    double lastTime = 0, currentTime;
 
     data->running = ARC_True;
     while(data->running){
-        // currentTime = SDL_GetTicks();
-        // data->dt = currentTime - lastTime;
-        // lastTime = currentTime;
+        currentTime = SDL_GetTicks();
+        data->dt = currentTime - lastTime;
+        lastTime = currentTime;
 
         data->running = ARC_Input_Update(data->input);