diff --git a/std/testing/asserts.ts b/std/testing/asserts.ts
index b7377c1bc0..a3f0c13387 100644
--- a/std/testing/asserts.ts
+++ b/std/testing/asserts.ts
@@ -21,13 +21,13 @@ export class AssertionError extends Error {
 
 export function _format(v: unknown): string {
   let string = globalThis.Deno
-    ? Deno.inspect(v, {
+    ? stripColor(Deno.inspect(v, {
       depth: Infinity,
       sorted: true,
       trailingComma: true,
       compact: false,
       iterableLimit: Infinity,
-    })
+    }))
     : String(v);
   if (typeof v == "string") {
     string = `"${string.replace(/(?=["\\])/g, "\\")}"`;
@@ -303,7 +303,7 @@ export function assertStrictEquals(
 }
 
 /**
- * Make an assertion that `actual` and `expected` are not strictly equal.  
+ * Make an assertion that `actual` and `expected` are not strictly equal.
  * If the values are strictly equal then throw.
  * ```ts
  * assertNotStrictEquals(1, 1)
diff --git a/std/testing/asserts_test.ts b/std/testing/asserts_test.ts
index f8a600d77a..4840bcf536 100644
--- a/std/testing/asserts_test.ts
+++ b/std/testing/asserts_test.ts
@@ -336,8 +336,10 @@ const createHeader = (): string[] => [
   "",
 ];
 
-const added: (s: string) => string = (s: string): string => green(bold(s));
-const removed: (s: string) => string = (s: string): string => red(bold(s));
+const added: (s: string) => string = (s: string): string =>
+  green(bold(stripColor(s)));
+const removed: (s: string) => string = (s: string): string =>
+  red(bold(stripColor(s)));
 
 Deno.test({
   name: "pass case",