diff --git a/include/display.js b/include/display.js
index f2ecdba3..1fe883cc 100644
--- a/include/display.js
+++ b/include/display.js
@@ -577,6 +577,12 @@ that.blitStringImage = function(str, x, y) {
     img.src = str;
 };
 
+// Wrap ctx.drawImage but relative to viewport
+that.drawImage = function(img, x, y) {
+    c_ctx.drawImage(img, x - viewport.x, y - viewport.y);
+};
+
+
 that.changeCursor = function(pixels, mask, hotx, hoty, w, h) {
     if (conf.cursor_uri === false) {
         Util.Warn("changeCursor called but no cursor data URI support");
diff --git a/include/rfb.js b/include/rfb.js
index 75a19e0c..91e68081 100644
--- a/include/rfb.js
+++ b/include/rfb.js
@@ -1562,7 +1562,7 @@ scan_tight_imgQ = function() {
             } else if (data.type === 'rgb') {
                 display.blitRgbImage(data.x, data.y, data.width, data.height, data.img.data, 0);
             } else {
-                ctx.drawImage(data.img, data.x, data.y);
+                display.drawImage(data.img, data.x, data.y);
             }
         }
         setTimeout(scan_tight_imgQ, scan_imgQ_rate);