diff --git a/less/input-groups.less b/less/input-groups.less
index 56c6cb62c8..abc399dc27 100644
--- a/less/input-groups.less
+++ b/less/input-groups.less
@@ -49,7 +49,7 @@
   font-weight: normal;
   line-height: 1;
   text-align: center;
-  background-color: @gray-lighter;
+  background-color: @input-group-addon-bg;
   border: 1px solid @input-group-addon-border-color;
   border-radius: @border-radius-base;
 
diff --git a/less/variables.less b/less/variables.less
index bbe58ede00..89e01700eb 100644
--- a/less/variables.less
+++ b/less/variables.less
@@ -147,6 +147,7 @@
 @legend-color:                   @gray-dark;
 @legend-border-color:            #e5e5e5;
 
+@input-group-addon-bg:           @gray-lighter;
 @input-group-addon-border-color: @input-border;