diff --git a/react-bootstrap/react-bootstrap.d.ts b/react-bootstrap/react-bootstrap.d.ts
index ca0fa37faa..6ba51c8815 100644
--- a/react-bootstrap/react-bootstrap.d.ts
+++ b/react-bootstrap/react-bootstrap.d.ts
@@ -157,7 +157,7 @@ declare module "react-bootstrap" {
//
interface CollapseProps
- extends TransitionCallbacks, React.Props
+ extends TransitionCallbacks, React.Props
{
dimension?: 'height' | 'width' | { ( ):string };
getDimensionValue?: ( dimension:number, element:React.ReactElement ) => number;