diff --git a/source/volcano.cpp b/source/volcano.cpp
index cefffd7..89e3edb 100644
--- a/source/volcano.cpp
+++ b/source/volcano.cpp
@@ -476,10 +476,10 @@ void LoadMap()
 		map.tile = new Uint8[size];
 		map.actor = new Uint8[size];
 
-		for (Uint32 i = 0; i < size; i++)
+		for (Uint32 i = 0; i < (Uint32)size; ++i)
 			SDL_RWread(file, &map.tile[i], sizeof(Uint8), 1);
 
-		for (Uint32 i = 0; i < size; i++)
+		for (Uint32 i = 0; i < (Uint32)size; ++i)
 			SDL_RWread(file, &map.actor[i], sizeof(Uint8), 1);
 
 		SDL_RWclose(file);