diff --git a/frameworks/compass/stylesheets/compass/css3/_background-size.scss b/frameworks/compass/stylesheets/compass/css3/_background-size.scss
index a9b7a04f..9d364470 100644
--- a/frameworks/compass/stylesheets/compass/css3/_background-size.scss
+++ b/frameworks/compass/stylesheets/compass/css3/_background-size.scss
@@ -8,9 +8,19 @@ $default-background-size: 100% auto !default;
 //
 // * percentages are relative to the background-origin (default = padding-box)
 // * mixin defaults to: `$default-background-size`
-@mixin background-size($size: $default-background-size) {
-  @if type-of($size) == string {
-    $size: unquote($size);
-  }
-  @include experimental(background-size, $size, -moz, -webkit, -o, not -ms, not -khtml);
+@mixin background-size(
+  $size-1: $default-background-size,
+  $size-2: false,
+  $size-3: false,
+  $size-4: false,
+  $size-5: false,
+  $size-6: false,
+  $size-7: false,
+  $size-8: false,
+  $size-9: false,
+  $size-10: false
+) {
+  $size-1: if(type-of($size-1) == string, unquote($size-1), $size-1);
+  $sizes: compact($size-1, $size-2, $size-3, $size-4, $size-5, $size-6, $size-7, $size-8, $size-9, $size-10);
+  @include experimental(background-size, $sizes, -moz, -webkit, -o, not -ms, not -khtml);
 }
diff --git a/frameworks/compass/stylesheets/compass/layout/_grid-background.scss b/frameworks/compass/stylesheets/compass/layout/_grid-background.scss
index 43677ac5..188dfa37 100644
--- a/frameworks/compass/stylesheets/compass/layout/_grid-background.scss
+++ b/frameworks/compass/stylesheets/compass/layout/_grid-background.scss
@@ -159,6 +159,6 @@ $grid-background-force-fluid      : false                        !default;
     get-baseline-gradient($baseline-color),
     get-column-gradient($total,$column,$gutter,$offset,$column-color,$gutter-color, $force-fluid)
   );
-  @include background-size((100% #{$baseline}, auto));
+  @include background-size(100% $baseline, auto);
   background-position: left top;
 }