diff --git a/types/index.d.ts b/types/index.d.ts
index 8ac18635ed..afe817cc9e 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -200,7 +200,7 @@ declare namespace math {
 
   interface ConditionalNode extends MathNodeCommon {
     type: 'ConditionalNode';
-    isConditionalnode: boolean;
+    isConditionalNode: boolean;
     condition: MathNode;
     trueExpr: MathNode;
     falseExpr: MathNode;