diff --git a/less/_import.less b/less/_import.less
index 399e271..9c177db 100644
--- a/less/_import.less
+++ b/less/_import.less
@@ -33,6 +33,7 @@
 
 // JavaScript
 @import "accordion";
+@import "drop";
 @import "dropdown";
 @import "modal";
 @import "slider";
diff --git a/less/drop.less b/less/drop.less
new file mode 100644
index 0000000..6cc7b1e
--- /dev/null
+++ b/less/drop.less
@@ -0,0 +1 @@
+@drop-z-index: @global-z-index - 19;
diff --git a/less/dropdown.less b/less/dropdown.less
index f5ef072..2b42884 100644
--- a/less/dropdown.less
+++ b/less/dropdown.less
@@ -1,4 +1,3 @@
-@dropdown-z-index: @global-z-index - 19;
 @dropdown-min-width: 260px;
 @dropdown-padding: 5px 0;
 @dropdown-background: @global-background;