diff --git a/types/rangy/index.d.ts b/types/rangy/index.d.ts
index b6615b9aad..4a3afc08a1 100644
--- a/types/rangy/index.d.ts
+++ b/types/rangy/index.d.ts
@@ -31,6 +31,7 @@ interface RangyRange extends Range {
     equals(range:RangyRange):boolean;
     refresh():any;
     select():any;
+    toCharacterRange(containerNode:Node):{start:number, end:number};
 }
 
 interface RangySelection extends Selection {
diff --git a/types/rangy/rangy-tests.ts b/types/rangy/rangy-tests.ts
index de2ec468f0..3b177a46b3 100644
--- a/types/rangy/rangy-tests.ts
+++ b/types/rangy/rangy-tests.ts
@@ -74,6 +74,7 @@ function testRangyRange() {
     rangyRange.splitBoundaries();
     assertString(rangyRange.toHtml());
     assertRangyRange(rangyRange.union(rangyRange));
+    let characterRange:{start:number, end:number} = rangyRange.toCharacterRange(new Node);
 }
 
 function testSelection() {