diff --git a/src/viewport.c b/src/viewport.c
index 06b8ab98ec..6152cec6d7 100644
--- a/src/viewport.c
+++ b/src/viewport.c
@@ -301,7 +301,7 @@ void viewport_paint(rct_viewport* viewport, rct_drawpixelinfo* dpi, int left, in
 	rct_drawpixelinfo* dpi2 = RCT2_ADDRESS(RCT2_ADDRESS_VIEWPORT_DPI, rct_drawpixelinfo);
 	dpi2->y = RCT2_GLOBAL(RCT2_ADDRESS_VIEWPORT_PAINT_Y, uint16);
 	dpi2->height = RCT2_GLOBAL(RCT2_ADDRESS_VIEWPORT_PAINT_HEIGHT, uint16);
-	dpi2->zoom_level = RCT2_GLOBAL(RCT2_ADDRESS_VIEWPORT_ZOOM, uint16);
+	dpi2->zoom_level = (uint8)RCT2_GLOBAL(RCT2_ADDRESS_VIEWPORT_ZOOM, uint16);
 
 	//Splits the screen into 32 pixel columns and renders them.
 	for (x = RCT2_GLOBAL(RCT2_ADDRESS_VIEWPORT_PAINT_X, uint16) & 0xFFFFFFE0;