diff --git a/lib/ComicBook.js b/lib/ComicBook.js
index 71bd4c1..a16105d 100755
--- a/lib/ComicBook.js
+++ b/lib/ComicBook.js
@@ -486,8 +486,13 @@ function ComicBook(id, srcs, opts) {
 
 			case "fitWidth":
 				document.body.style.overflowX = "hidden";
-				zoom_scale = (window.innerWidth > width) ? ((window.innerWidth - width) / window.innerWidth) + 1 // scale up if the window is wider than the page
-					  : window.innerWidth / width; // scale down if the window is narrower than the page
+				
+				zoom_scale = (window.innerWidth > width)
+					? ((window.innerWidth - width) / window.innerWidth) + 1 // scale up if the window is wider than the page
+					: window.innerWidth / width; // scale down if the window is narrower than the page
+
+				// update the interal scale var so switching zoomModes while zooming will be smooth
+				scale = zoom_scale
 				break;
 
 			default: