diff --git a/src/types/index.ts b/src/types/index.ts
index 2e1cca1ca..8006aa1a2 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -303,7 +303,7 @@ export type ConnectionLineComponentProps = {
   targetPosition?: Position;
   connectionLineStyle?: CSSProperties;
   connectionLineType: ConnectionLineType;
-  sourceNode?: Node | null;
+  sourceNode?: Node;
   sourceHandle?: HandleElement;
 };