diff --git a/lib/webshot.phantom.js b/lib/webshot.phantom.js
index 7147cdb..b5ccdcd 100644
--- a/lib/webshot.phantom.js
+++ b/lib/webshot.phantom.js
@@ -69,6 +69,29 @@ var toOverwrite = optUtils.mergeObjects(
 
 optUtils.phantomPage.forEach(function(key) {
   if (toOverwrite[key]) page[key] = toOverwrite[key];
+  if (key === "paperSize" && page[key] && page[key].header && page[key].header.contents) {
+    var header = {
+      "height": page[key].header.height,
+      "contents": phantom.callback(function() { return options.paperSize.header.contents; })
+    };
+    page.paperSize.header = header;
+  }
+  if (key === "paperSize" && page[key] && page[key].footer && page[key].footer.contents) {
+    var footer = {
+      "height": page[key].footer.height,
+      "contents": phantom.callback(function() { return options.paperSize.footer.contents; })
+    };
+    page[key].footer = footer;
+  }
+  if (key === "paperSize") {
+    page.paperSize = {
+      "format": options.paperSize.format,
+      "orientation": options.paperSize.orientation,
+      "margin": options.paperSize.margin,
+      "header": header,
+      "footer": footer
+    };
+  }
 });
 
 // The function that actually performs the screen rendering