diff --git a/src/lib/sw_engine/tvgSwCommon.h b/src/lib/sw_engine/tvgSwCommon.h
index 87577f96..de4ca357 100644
--- a/src/lib/sw_engine/tvgSwCommon.h
+++ b/src/lib/sw_engine/tvgSwCommon.h
@@ -111,7 +111,7 @@ struct SwOutline
 
 struct SwSpan
 {
-    int16_t x, y;
+    uint16_t x, y;
     uint16_t len;
     uint8_t coverage;
 };