diff --git a/compottie-dot/src/wasmJsMain/kotlin/io/github/alexzhirkevich/compottie/Conversion.wasmJs.kt b/compottie-dot/src/wasmJsMain/kotlin/io/github/alexzhirkevich/compottie/Conversion.wasmJs.kt
index 1e9791b2..b1b31bdf 100644
--- a/compottie-dot/src/wasmJsMain/kotlin/io/github/alexzhirkevich/compottie/Conversion.wasmJs.kt
+++ b/compottie-dot/src/wasmJsMain/kotlin/io/github/alexzhirkevich/compottie/Conversion.wasmJs.kt
@@ -2,6 +2,7 @@ package io.github.alexzhirkevich.compottie
 
 import org.khronos.webgl.ArrayBuffer
 import org.khronos.webgl.Int8Array
+import org.khronos.webgl.Uint8Array
 import org.khronos.webgl.get
 import org.khronos.webgl.set
 import kotlin.wasm.unsafe.UnsafeWasmMemoryApi
@@ -32,11 +33,11 @@ internal fun createSourceUnstable(data : JsReference<ByteArray>) : JsAny = js(""
 """)
 
 internal fun ArrayBuffer.toByteArray(): ByteArray {
-    return Int8Array(this).toByteArray()
+    return Uint8Array(this).toByteArray()
 }
 
 @OptIn(ExperimentalCompottieApi::class)
-internal fun Int8Array.toByteArray(): ByteArray {
+internal fun Uint8Array.toByteArray(): ByteArray {
 
     if (Compottie.useStableWasmMemoryManagement) {
         return ByteArray(byteLength) {
@@ -81,14 +82,14 @@ private fun byteArrayToInt8ArrayImpl(a: JsReference<ByteArray>): Int8Array = js(
 
 @JsFun(
     """ (src, size, dstAddr) => {
-        const mem8 = new Int8Array(wasmExports.memory.buffer, dstAddr, size);
+        const mem8 = new Uint8Array(wasmExports.memory.buffer, dstAddr, size);
         mem8.set(src);
     }
 """
 )
-private external fun jsExportInt8ArrayToWasm(src: Int8Array, size: Int, dstAddr: Int)
+private external fun jsExportInt8ArrayToWasm(src: Uint8Array, size: Int, dstAddr: Int)
 
-private fun jsInt8ArrayToKotlinByteArray(x: Int8Array): ByteArray {
+private fun jsInt8ArrayToKotlinByteArray(x: Uint8Array): ByteArray {
     val size = x.length
 
     @OptIn(UnsafeWasmMemoryApi::class)
diff --git a/compottie-dot/src/wasmJsMain/kotlin/io/github/alexzhirkevich/compottie/ZipFileSystem.wasmJs.kt b/compottie-dot/src/wasmJsMain/kotlin/io/github/alexzhirkevich/compottie/ZipFileSystem.wasmJs.kt
index 7ccf3d9e..51c11084 100644
--- a/compottie-dot/src/wasmJsMain/kotlin/io/github/alexzhirkevich/compottie/ZipFileSystem.wasmJs.kt
+++ b/compottie-dot/src/wasmJsMain/kotlin/io/github/alexzhirkevich/compottie/ZipFileSystem.wasmJs.kt
@@ -2,6 +2,7 @@ package io.github.alexzhirkevich.compottie
 
 
 import org.khronos.webgl.Int8Array
+import org.khronos.webgl.Uint8Array
 
 @OptIn(ExperimentalCompottieApi::class)
 internal actual suspend fun decompress(array: ByteArray, decompressedSize : Int) : ByteArray {
@@ -28,10 +29,10 @@ internal actual suspend fun decompress(array: ByteArray, decompressedSize : Int)
             break
         }
 
-        val chunk = Int8Array(result.value.buffer).toByteArray()
+        val chunk = Uint8Array(result.value.buffer).toByteArray()
 
         chunk.copyInto(decompressed, ind)
-        ind += array.size
+        ind += chunk.size
     }
 
     return decompressed