diff --git a/src/render/render.cpp b/src/render/render.cpp
index 6ec6d7d1b..20fcaf73f 100644
--- a/src/render/render.cpp
+++ b/src/render/render.cpp
@@ -19,6 +19,8 @@
 #include "gfx/clip.h"
 #include "gfx/region.h"
 
+#include <cmath>
+
 namespace render {
 
 namespace {
@@ -754,6 +756,13 @@ void Render::renderBackground(Image* image,
   if (tile_w < zoom.apply(1)) tile_w = zoom.apply(1);
   if (tile_h < zoom.apply(1)) tile_h = zoom.apply(1);
 
+  // Tiles must be aligned with pixels
+  double intpart;
+  if (std::modf(double(tile_w) / zoom.apply(1.0), &intpart) != 0.0)
+    tile_w = intpart*zoom.apply(1);
+  if (std::modf(double(tile_h) / zoom.apply(1.0), &intpart) != 0.0)
+    tile_h = intpart*zoom.apply(1);
+
   if (tile_w < 1) tile_w = 1;
   if (tile_h < 1) tile_h = 1;