diff --git a/src/display.cpp b/src/display.cpp
index 51a6e23c1904..293d8dc4790b 100644
--- a/src/display.cpp
+++ b/src/display.cpp
@@ -1551,6 +1551,7 @@ void display::render_image(int x, int y, const display::drawing_layer drawing_la
 	//} else if(alpha != 1.0 && blendto != 0) {
 	//	surf.assign(blend_surface(surf,1.0-alpha,blendto));
 	} else if(alpha != ftofxp(1.0)) {
+		surf = surf.clone();
 		adjust_surface_alpha(surf, alpha);
 	}