diff --git a/changelog.txt b/changelog.txt
index 1e7f78a5..e73a5cb7 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -42,6 +42,7 @@ OPENSEADRAGON CHANGELOG
 * Turning off scrollToZoom in gestureSettings now allows scroll events to propagate
 * You can now set a minZoomLevel that's greater than the home zoom level
 * Added union() to OpenSeadragon.Rect
+* Fixed an error in fitBounds if the new and old bounds were extremely close in size
 
 1.2.1: (in progress)
 
diff --git a/src/viewport.js b/src/viewport.js
index 0f7f5cf1..d6fc2984 100644
--- a/src/viewport.js
+++ b/src/viewport.js
@@ -586,7 +586,8 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
             newBounds = this._applyBoundaryConstraints( newBounds, immediately );
         }
 
-        if ( newZoom == oldZoom || newBounds.width == oldBounds.width ) {
+        if (Math.abs(newZoom - oldZoom) < 0.00000000001 ||
+                Math.abs(newBounds.width - oldBounds.width) < 0.00000000001) {
             return this.panTo( constraints ? newBounds.getCenter() : center, immediately );
         }