diff --git a/projects/mtg/src/GameApp.cpp b/projects/mtg/src/GameApp.cpp
index 9a6613b51..e6b1661e1 100644
--- a/projects/mtg/src/GameApp.cpp
+++ b/projects/mtg/src/GameApp.cpp
@@ -187,10 +187,10 @@ void GameApp::Create()
   JSoundSystem::GetInstance()->SetMusicVolume(options[Options::MUSICVOLUME].number);
 
   char buf[512];
-  sprintf(buf, "size of MTGCard : %i\n" , sizeof(MTGCard));
+  sprintf(buf, "size of MTGCard : %lu\n" , sizeof(MTGCard));
   OutputDebugString(buf);
 
-  sprintf(buf, "size of CardPrimitive : %i\n" , sizeof(CardPrimitive));
+  sprintf(buf, "size of CardPrimitive : %lu\n" , sizeof(CardPrimitive));
   OutputDebugString(buf);
 }
 
@@ -296,7 +296,7 @@ void GameApp::Update()
 void GameApp::Render()
 {
   if (systemError.size()){
-    fprintf(stderr, systemError.c_str());
+    fprintf(stderr, "%s", systemError.c_str());
     JLBFont * mFont= resources.GetJLBFont("simon");
     if (mFont) mFont->DrawString(systemError.c_str(),1,1);
     return;
diff --git a/projects/mtg/src/WResourceManager.cpp b/projects/mtg/src/WResourceManager.cpp
index 479403655..7826fe4d7 100644
--- a/projects/mtg/src/WResourceManager.cpp
+++ b/projects/mtg/src/WResourceManager.cpp
@@ -57,7 +57,7 @@ void WResourceManager::DebugRender(){
   if(textureWCache.totalSize > textureWCache.cacheSize)
     man = textureWCache.totalSize - textureWCache.cacheSize;
 
-  sprintf(buf,"Textures %u+%u (of %u) items (%u misses), Pixels: %lu (of %lu) + %lu",
+  sprintf(buf,"Textures %u+%lu (of %u) items (%u misses), Pixels: %lu (of %lu) + %lu",
     textureWCache.cacheItems, textureWCache.managed.size(),textureWCache.maxCached,
     misses,textureWCache.cacheSize,textureWCache.maxCacheSize,man);
   font->DrawString(buf, 10,5);