2 files changed, 2 insertions, 7 deletions
diff --git a/io/bufio.ts b/io/bufio.ts
index 0dd2b94b4..05e6b0a0c 100644
--- a/io/bufio.ts
+++ b/io/bufio.ts
@@ -4,7 +4,8 @@
 // license that can be found in the LICENSE file.
 
 import { Reader, ReadResult, Writer } from "deno";
-import { assert, charCode, copyBytes } from "./util.ts";
+import { charCode, copyBytes } from "./util.ts";
+import { assert } from "../testing/mod.ts";
 
 const DEFAULT_BUF_SIZE = 4096;
 const MIN_BUF_SIZE = 16;
diff --git a/io/util.ts b/io/util.ts
index 811940b4d..3266e5018 100644
--- a/io/util.ts
+++ b/io/util.ts
@@ -1,11 +1,5 @@
 import { Buffer, Reader } from "deno";
 
-export function assert(cond: boolean, msg = "assert") {
-  if (!cond) {
-    throw Error(msg);
-  }
-}
-
 // `off` is the offset into `dst` where it will at which to begin writing values
 // from `src`.
 // Returns the number of bytes copied.