diff --git a/packages/simplebar/src/simplebar.js b/packages/simplebar/src/simplebar.js
index 98fdfdad..a5b05fb6 100755
--- a/packages/simplebar/src/simplebar.js
+++ b/packages/simplebar/src/simplebar.js
@@ -64,6 +64,14 @@ export default class SimpleBar {
 
     SimpleBar.getRtlHelpers = memoize(SimpleBar.getRtlHelpers);
 
+    const elWindow = getElementWindow(this.el);
+    const elOverflowY = elWindow.getComputedStyle(this.el).overflowY;
+    const parentDisplay = elWindow.getComputedStyle(this.el.parentElement).display;
+    if ((elOverflowY == 'auto' || elOverflowY == 'scroll')
+      && (parentDisplay == 'flex' || parentDisplay == 'inline-flex')) {
+      // Prevent bug where Simplebar is shown along with the native scrollbar.
+      this.el.style.height = '100%';
+    }
     this.init();
   }