diff --git a/packages/crypto/src/bip39.ts b/packages/crypto/src/bip39.ts
index 1d90ca16fe..b8ac453679 100644
--- a/packages/crypto/src/bip39.ts
+++ b/packages/crypto/src/bip39.ts
@@ -2177,6 +2177,18 @@ export class EnglishMnemonic {
   }
 }
 
+async function getSubtle(): Promise<any | undefined> {
+  const g: any = globalThis;
+  let subtle = g.crypto && g.crypto.subtle;
+  if (!subtle) {
+    const crypto: any = await import("crypto");
+    if (crypto.webcrypto && crypto.webcrypto.subtle) {
+      subtle = crypto.webcrypto.subtle;
+    }
+  }
+  return subtle;
+}
+
 export class Bip39 {
   /**
    * Encodes raw entropy of length 16, 20, 24, 28 or 32 bytes as an English mnemonic between 12 and 24 words.
@@ -2215,13 +2227,7 @@ export class Bip39 {
     iterations: number,
     keylen: number,
   ): Promise<Uint8Array> {
-    const g: any = globalThis;
-    let subtle = g.crypto && g.crypto.subtle;
-    if (!subtle) {
-      const crypto = await import("crypto");
-      subtle = (crypto as any).webcrypto.subtle;
-    }
-
+    const subtle = await getSubtle();
     if (subtle) {
       return subtle
         .importKey("raw", secret, { name: "PBKDF2" }, false, ["deriveBits"])