diff --git a/src/common.hpp b/src/common.hpp
index 4d27b41..c56a223 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -3,6 +3,7 @@
 
 #include <SDL2/SDL.h>
 
+#include <iostream>
 #include <string>
 
 enum OperationMode {
diff --git a/src/engine/progressiverenderer.cpp b/src/engine/progressiverenderer.cpp
index dbe1397..b34ba79 100644
--- a/src/engine/progressiverenderer.cpp
+++ b/src/engine/progressiverenderer.cpp
@@ -43,6 +43,8 @@ void ProgressiveRenderer::Render() {
             }
         }
 
+        std::cout << "frame" << std::endl;
+
         // Swap framebuffers
         m_interface->Update();
     }