diff --git a/src/model/Map.cpp b/src/model/Map.cpp
index ac0b6ee..ee413cf 100644
--- a/src/model/Map.cpp
+++ b/src/model/Map.cpp
@@ -117,7 +117,7 @@ std::unique_ptr<Map> Map::load(__attribute__((unused)) const std::string &name)
 		unsigned rot;
 		char *tile = nullptr;
 
-		if (std::sscanf(line.c_str(), "%c %u %ms", &c, &rot, &tile) != 3) {
+		if (std::sscanf(line.c_str(), "%c %u %ms", &c, &rot, &tile) != 3 || rot >= 4) {
 			std::free(tile);
 			throw std::invalid_argument("invalid map file");
 		}