diff --git a/jquery.tools/index.d.ts b/jquery.tools/index.d.ts
index 1ab90e260a..e511a961fd 100644
--- a/jquery.tools/index.d.ts
+++ b/jquery.tools/index.d.ts
@@ -62,7 +62,7 @@ declare namespace JQueryTools {
              * uses an effect called "default" which is a simple show/hide effect.
              * @default 'default'
              */
-            effect?: 'default' | string;
+            effect?: string;
             /**
              * since 1.2.0. whether overlay stays in the same position while the screen
              * is scrolled. This is the default behaviour for all browsers except IE6
@@ -117,7 +117,7 @@ declare namespace JQueryTools {
              * is vertically centered. Percentage values work consistently at different screen resolutions.
              * @default '10%'
              */
-            top?: 'center' | string | number;
+            top?: string | number;
 
             /**
              * before the overlay is displayed. The overlay has already been positioned at the
diff --git a/jquery.tools/jquery.tools-tests.ts b/jquery.tools/jquery.tools-tests.ts
index 44c1ddea64..f8a4e39f90 100644
--- a/jquery.tools/jquery.tools-tests.ts
+++ b/jquery.tools/jquery.tools-tests.ts
@@ -29,7 +29,7 @@
 $(".my_overlay_trigger").overlay({
     // one configuration property
     mask: {
-      color: '#ccc'  
+      color: '#ccc'
     },
     // another property
     top: 50