diff --git a/src/worldviewport.cpp b/src/worldviewport.cpp
index 99f57ce..9b72e61 100644
--- a/src/worldviewport.cpp
+++ b/src/worldviewport.cpp
@@ -2,6 +2,7 @@
 #include "worldgrid.hpp"
 #include "compatibility.h"
 #include <cassert>
+#include <algorithm>
 
 namespace curry {
 	namespace {
@@ -11,8 +12,8 @@ namespace curry {
 			const auto pos = vector_cast<vec2i>(parViewport.position());
 			const auto ts = parViewport.world()->tile_size();
 			return vec2us(
-				static_cast<uint16_t>(pos.x() / ts.x()),
-				static_cast<uint16_t>(pos.y() / ts.y())
+				static_cast<uint16_t>(std::max(0, pos.x()) / ts.x()),
+				static_cast<uint16_t>(std::max(0, pos.y()) / ts.y())
 			);
 		}
 	} //unnamed namespace