diff --git a/src/huggingface_tokenizer.cc b/src/huggingface_tokenizer.cc
index 2136005..6cbe0d8 100644
--- a/src/huggingface_tokenizer.cc
+++ b/src/huggingface_tokenizer.cc
@@ -15,7 +15,11 @@ namespace tokenizers {
  */
 class HFTokenizer : public Tokenizer {
  public:
-  explicit HFTokenizer(TokenizerHandle handle) : handle_(handle) {}
+  explicit HFTokenizer(TokenizerHandle handle) : handle_(handle) {
+    #ifdef COMPILE_WASM_RUNTIME
+    setenv("TOKENIZERS_PARALLELISM", "false", true);
+    #endif
+  }
 
   HFTokenizer(const HFTokenizer&) = delete;
   HFTokenizer(HFTokenizer&& other) { std::swap(other.handle_, handle_); }
diff --git a/web/build.sh b/web/build.sh
index e4e048c..ecedadf 100755
--- a/web/build.sh
+++ b/web/build.sh
@@ -5,7 +5,7 @@ rustup target add wasm32-unknown-emscripten
 
 mkdir -p build
 cd build
-emcmake cmake ../.. -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-O3"
+emcmake cmake ../.. -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-O3 -DCOMPILE_WASM_RUNTIME"
 emmake make tokenizers_cpp tokenizers_c sentencepiece-static -j8
 cd ..
 
diff --git a/web/tests/src/index.ts b/web/tests/src/index.ts
index caaa37c..bb7b5bc 100644
--- a/web/tests/src/index.ts
+++ b/web/tests/src/index.ts
@@ -48,8 +48,21 @@ async function testLlamaTokenizer() {
   }
 }
 
+// Without COMPILE_WASM_RUNTIME, this triggers parallel processing, leading to error
+async function testBertTokenizer() {
+  console.log("Bert Tokenizer");
+  const modelBuffer = await (await
+    fetch("https://huggingface.co/Snowflake/snowflake-arctic-embed-l/raw/main/tokenizer.json")
+  ).arrayBuffer();
+  const tok = await Tokenizer.fromJSON(modelBuffer);
+  const text = "What is the capital of Canada?";
+  const ids = tok.encode(text);
+  console.log(ids);
+}
+
 async function main() {
   await testJSONTokenizer()
+  await testBertTokenizer();
   await testLlamaTokenizer()
 }