diff --git a/types/jest/index.d.ts b/types/jest/index.d.ts
index 80957f32ad..c0ab376ae5 100644
--- a/types/jest/index.d.ts
+++ b/types/jest/index.d.ts
@@ -11,6 +11,7 @@
 //                 Jamie Mason <https://github.com/JamieMason>
 //                 Douglas Duteil <https://github.com/douglasduteil>
 //                 Ahn <https://github.com/AhnpGit>
+//                 Bradley Ayers <https://github.com/bradleyayers>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -230,8 +231,8 @@ declare namespace jest {
     interface MatcherUtils {
         readonly isNot: boolean;
         utils: {
-            readonly EXPECTED_COLOR: string;
-            readonly RECEIVED_COLOR: string;
+            readonly EXPECTED_COLOR: (text: string) => string;
+            readonly RECEIVED_COLOR: (text: string) => string;
             ensureActualIsNumber(actual: any, matcherName?: string): void;
             ensureExpectedIsNumber(actual: any, matcherName?: string): void;
             ensureNoExpected(actual: any, matcherName?: string): void;