diff --git a/lib/compass/sass_extensions/functions/sprites.rb b/lib/compass/sass_extensions/functions/sprites.rb
index b660514a..7df04e20 100644
--- a/lib/compass/sass_extensions/functions/sprites.rb
+++ b/lib/compass/sass_extensions/functions/sprites.rb
@@ -331,7 +331,7 @@ module Compass::SassExtensions::Functions::Sprites
     if offset_x.unit_str == "%"
       x = offset_x # CE: Shouldn't this be a percentage of the total width?
     else
-      x = offset_x.value + image[:left]
+      x = offset_x.value - image[:left]
       x = Sass::Script::Number.new(x, x == 0 ? [] : ["px"])
     end
     y = offset_y.value - image[:top]
diff --git a/spec/sprites_spec.rb b/spec/sprites_spec.rb
index 331729d7..ee26a915 100644
--- a/spec/sprites_spec.rb
+++ b/spec/sprites_spec.rb
@@ -277,7 +277,7 @@ describe Compass::Sprites do
       }
       
       .adjusted-px-1 {
-        background-position: 14px 0;
+        background-position: -6px 0;
       }
       
       .adjusted-px-2 {
@@ -315,7 +315,7 @@ describe Compass::Sprites do
       }
       
       .adjusted-px-1 {
-        background-position: 14px 0;
+        background-position: -6px 0;
       }
       
       .adjusted-px-2 {
@@ -362,11 +362,11 @@ describe Compass::Sprites do
       }
       
       .squares-ten-by-ten {
-        background-position: 10px 0;
+        background-position: -10px 0;
       }
       
       .squares-twenty-by-twenty {
-        background-position: 10px -10px;
+        background-position: -10px -10px;
       }
     CSS
     image_size('squares-*.png').should == [30, 30]