diff --git a/Gemfile.lock b/Gemfile.lock
index 120a1b12..0dc7c833 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,7 @@ GIT
 PATH
   remote: .
   specs:
-    compass (0.11.beta.6.e66c822)
+    compass (0.11.beta.6.bc4e3ee)
       chunky_png (~> 1.1.0)
       sass (>= 3.1.0.alpha.249)
 
diff --git a/frameworks/compass/stylesheets/compass/layout/_grid-background.scss b/frameworks/compass/stylesheets/compass/layout/_grid-background.scss
index 3e46da83..43677ac5 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;
 }