diff --git a/4chan_x.js b/4chan_x.js
index ded18016e..c8f463ed9 100644
--- a/4chan_x.js
+++ b/4chan_x.js
@@ -1936,8 +1936,9 @@
         case 'full':
           return img.removeAttribute('style');
         case 'fit width':
-          if (iw > cw) {
-            img.style.width = '100%';
+          ratio = cw / iw;
+          if (ratio < 1) {
+            img.style.width = Math.floor(ratio * iw);
             return img.style.margin = '0px';
           }
           break;
diff --git a/script.coffee b/script.coffee
index b85ed1057..f931b77e2 100644
--- a/script.coffee
+++ b/script.coffee
@@ -1472,13 +1472,14 @@ imgExpand =
       when 'full'
         img.removeAttribute 'style'
       when 'fit width'
-        if iw > cw
-          img.style.width = '100%'
+        ratio = cw/iw
+        if ratio < 1
+          # y'know, this width is constant between resizes
+          img.style.width = Math.floor ratio * iw
           img.style.margin = '0px'
       when 'fit screen'
         ratio = Math.min cw/iw, ch/ih
         if ratio < 1
-          #XXX maybe needs + 'px' ?
           img.style.width = Math.floor ratio * iw
           img.style.margin = '0px'