diff --git a/src/graphics/Renderer.cpp b/src/graphics/Renderer.cpp
index 01d9aac0de..7d691cb369 100644
--- a/src/graphics/Renderer.cpp
+++ b/src/graphics/Renderer.cpp
@@ -1041,7 +1041,7 @@ void Renderer::render_gravlensing(pixel * source)
 			gy = (int)(ny-sim->gravy[co]*0.875f+0.5f);
 			bx = (int)(nx-sim->gravx[co]+0.5f);
 			by = (int)(ny-sim->gravy[co]+0.5f);
-			if(rx > 0 && rx < XRES && ry > 0 && ry < YRES && gx > 0 && gx < XRES && gy > 0 && gy < YRES && bx > 0 && bx < XRES && by > 0 && by < YRES)
+			if(rx >= 0 && rx < XRES && ry >= 0 && ry < YRES && gx >= 0 && gx < XRES && gy >= 0 && gy < YRES && bx >= 0 && bx < XRES && by >= 0 && by < YRES)
 			{
 				t = dst[ny*(VIDXRES)+nx];
 				r = PIXR(src[ry*(VIDXRES)+rx]) + PIXR(t);