diff --git a/std/assembly/index.d.ts b/std/assembly/index.d.ts
index 64713bf8..058231ae 100644
--- a/std/assembly/index.d.ts
+++ b/std/assembly/index.d.ts
@@ -526,6 +526,8 @@ declare abstract class TypedArray<T> implements ArrayBufferView<T> {
 declare class Int8Array extends TypedArray<i8> {}
 /** An array of 8-bit unsigned integers. */
 declare class Uint8Array extends TypedArray<u8> {}
+/** A clamped array of 8-bit unsigned integers. */
+declare class Uint8ClampedArray extends TypedArray<u8> {}
 /** An array of twos-complement 16-bit signed integers. */
 declare class Int16Array extends TypedArray<i16> {}
 /** An array of 16-bit unsigned integers. */
diff --git a/std/portable/index.d.ts b/std/portable/index.d.ts
index 1123350b..7929becc 100644
--- a/std/portable/index.d.ts
+++ b/std/portable/index.d.ts
@@ -382,6 +382,7 @@ declare class Array<T> {
 }
 
 declare class Uint8Array extends Array<u8> {}
+declare class Uint8ClampedArray extends Array<u8> {}
 declare class Uint16Array extends Array<u16> {}
 declare class Uint32Array extends Array<u32> {}
 declare class Int8Array extends Array<i8> {}