diff --git a/xSDL/xApplication.h b/xSDL/xApplication.h
index bf0b409..01961db 100644
--- a/xSDL/xApplication.h
+++ b/xSDL/xApplication.h
@@ -64,8 +64,8 @@
 			void syncFps();
 
 			// fps management
-			uint32_t _lasttick;
-			uint32_t _fpstime;
+			uint32_t _lasttick { 0 };
+			uint32_t _fpstime { (int) 1000.0/60 };
 
 			// event management
 			xController _controller;
@@ -77,11 +77,11 @@
 			set<xOrchestrable*> _orchestrables;
 
 			// sdl objects
-			SDL_Window   *_window;
-			SDL_Rect      _winrect;
+			SDL_Window   *_window { NULL };
+			SDL_Rect      _winrect { 0, 0, 0, 0 };
 
-			SDL_Renderer *_renderer;
-			SDL_Texture  *_texture;
+			SDL_Renderer *_renderer { NULL };
+			SDL_Texture  *_texture { NULL };
 
 			// thread safety
 			mutex _mutex_draw;