diff --git a/scss/_forms.scss b/scss/_forms.scss
index 6a02a1999f..7d16d013b5 100644
--- a/scss/_forms.scss
+++ b/scss/_forms.scss
@@ -22,7 +22,7 @@
   border: $border-width solid $input-border;
    // Note: This has no effect on <select>s in some browsers, due to the limited stylability of `<select>`s in CSS.
   @include border-radius($input-border-radius);
-  @include box-shadow(inset 0 1px 1px rgba(0,0,0,.075));
+  @include box-shadow($input-box-shadow);
   transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
 
   // Make inputs at least the height of their button counterpart (base line-height + padding + border).
diff --git a/scss/_variables.scss b/scss/_variables.scss
index 3150991bbb..d1e301f8fe 100644
--- a/scss/_variables.scss
+++ b/scss/_variables.scss
@@ -178,6 +178,7 @@ $input-bg-disabled:              $gray-lighter !default;
 
 $input-color:                    $gray !default;
 $input-border:                   #ccc !default;
+$input-box-shadow:               inset 0 1px 1px rgba(0,0,0,.075) !default;
 
 $input-border-radius:            $border-radius !default;
 $input-border-radius-lg:         $border-radius-lg !default;