diff --git a/lib/draggable_scrollbar.dart b/lib/draggable_scrollbar.dart
index 93e3a69..ffffb55 100755
--- a/lib/draggable_scrollbar.dart
+++ b/lib/draggable_scrollbar.dart
@@ -20,7 +20,7 @@ typedef Text LabelTextBuilder(double offsetY);
 /// for quick navigation of the BoxScrollView.
 class DraggableScrollbar extends StatefulWidget {
   /// The view that will be scrolled with the scroll thumb
-  final BoxScrollView child;
+  final Widget child;
 
   /// A function that builds a thumb using the current configuration
   final ScrollThumbBuilder scrollThumbBuilder;
@@ -67,7 +67,6 @@ class DraggableScrollbar extends StatefulWidget {
     this.labelConstraints,
   })  : assert(controller != null),
         assert(scrollThumbBuilder != null),
-        assert(child.scrollDirection == Axis.vertical),
         super(key: key);
 
   DraggableScrollbar.rrect({
@@ -83,8 +82,7 @@ class DraggableScrollbar extends StatefulWidget {
     this.scrollbarTimeToFade = const Duration(milliseconds: 600),
     this.labelTextBuilder,
     this.labelConstraints,
-  })  : assert(child.scrollDirection == Axis.vertical),
-        scrollThumbBuilder =
+  })  : scrollThumbBuilder =
             _thumbRRectBuilder(scrollThumbKey, alwaysVisibleScrollThumb),
         super(key: key);
 
@@ -101,8 +99,7 @@ class DraggableScrollbar extends StatefulWidget {
     this.scrollbarTimeToFade = const Duration(milliseconds: 600),
     this.labelTextBuilder,
     this.labelConstraints,
-  })  : assert(child.scrollDirection == Axis.vertical),
-        scrollThumbBuilder =
+  })  : scrollThumbBuilder =
             _thumbArrowBuilder(scrollThumbKey, alwaysVisibleScrollThumb),
         super(key: key);
 
@@ -119,8 +116,7 @@ class DraggableScrollbar extends StatefulWidget {
     this.scrollbarTimeToFade = const Duration(milliseconds: 600),
     this.labelTextBuilder,
     this.labelConstraints,
-  })  : assert(child.scrollDirection == Axis.vertical),
-        scrollThumbBuilder = _thumbSemicircleBuilder(
+  })  : scrollThumbBuilder = _thumbSemicircleBuilder(
             heightScrollThumb * 0.6, scrollThumbKey, alwaysVisibleScrollThumb),
         super(key: key);