diff --git a/packages/npm-packages/ruby-wasm-wasi/src/bindgen/rb-js-abi-host.js b/packages/npm-packages/ruby-wasm-wasi/src/bindgen/rb-js-abi-host.js
index 02aa2fb46..18b15829e 100644
--- a/packages/npm-packages/ruby-wasm-wasi/src/bindgen/rb-js-abi-host.js
+++ b/packages/npm-packages/ruby-wasm-wasi/src/bindgen/rb-js-abi-host.js
@@ -69,9 +69,16 @@ export function addRbJsAbiHostToImports(imports, obj, get_export) {
   imports["rb-js-abi-host"]["js-value-to-string: func(value: handle<js-abi-value>) -> string"] = function(arg0, arg1) {
     const memory = get_export("memory");
     const realloc = get_export("cabi_realloc");
-    const ret0 = obj.jsValueToString(resources0.get(arg0));
-    const ptr0 = utf8_encode(ret0, realloc, memory);
-    const len0 = UTF8_ENCODED_LEN;
+    const ret0 = resources0.get(arg0);
+    let ptr0, len0;
+    if (ret0 instanceof ArrayBuffer) {
+      ptr0 = realloc(0, 0, 1, ret0.byteLength);
+      len0 = ret0.byteLength;
+      new Uint8Array(memory.buffer).set(new Uint8Array(ret0), ptr0);
+    } else {
+      ptr0 = utf8_encode(obj.jsValueToString(ret0), realloc, memory);
+      len0 = UTF8_ENCODED_LEN;
+    }
     data_view(memory).setInt32(arg1 + 4, len0, true);
     data_view(memory).setInt32(arg1 + 0, ptr0, true);
   };