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-rw-r--r--engines/sci/engine/kgraphics.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/engines/sci/engine/kgraphics.cpp b/engines/sci/engine/kgraphics.cpp
index dae2197533..e991070ee7 100644
--- a/engines/sci/engine/kgraphics.cpp
+++ b/engines/sci/engine/kgraphics.cpp
@@ -260,7 +260,7 @@ reg_t kGraphDrawLine(EngineState *s, int argc, reg_t *argv) {
reg_t kGraphSaveBox(EngineState *s, int argc, reg_t *argv) {
Common::Rect rect = getGraphRect(argv);
- uint16 screenMask = (argc > 4) ? argv[4].toUint16() : 0;
+ uint16 screenMask = argv[4].toUint16() & GFX_SCREEN_MASK_ALL;
return g_sci->_gfxPaint16->kernelGraphSaveBox(rect, screenMask);
}