diff --git a/packages/taler-wallet-core/package.json b/packages/taler-wallet-core/package.json
index 9956cb312..e14ae0dd2 100644
--- a/packages/taler-wallet-core/package.json
+++ b/packages/taler-wallet-core/package.json
@@ -68,7 +68,7 @@
   },
   "ava": {
     "files": [
-      "lib/**/*test*"
+      "lib/**/*test.*"
     ]
   }
 }
diff --git a/packages/taler-wallet-core/src/crypto/primitives/nacl-fast.ts b/packages/taler-wallet-core/src/crypto/primitives/nacl-fast.ts
index acaebf546..711c83ec6 100644
--- a/packages/taler-wallet-core/src/crypto/primitives/nacl-fast.ts
+++ b/packages/taler-wallet-core/src/crypto/primitives/nacl-fast.ts
@@ -5,6 +5,12 @@
 // Implementation derived from TweetNaCl version 20140427.
 // See for details: http://tweetnacl.cr.yp.to/
 
+import { createRequire } from "module";
+
+// We need this require function to synchronously
+// import the "crypto" module in the CSPRNG initialization.
+const require = createRequire(import.meta.url);
+
 const gf = function (init: number[] = []): Float64Array {
   const r = new Float64Array(16);
   if (init) for (let i = 0; i < init.length; i++) r[i] = init[i];
@@ -3021,7 +3027,7 @@ export function secretbox_open(
   return m.subarray(crypto_secretbox_ZEROBYTES);
 }
 
-(function () {
+function initPRNG() {
   // Initialize PRNG if environment provides CSPRNG.
   // If not, methods calling randombytes will throw.
   // @ts-ignore-error
@@ -3050,4 +3056,6 @@ export function secretbox_open(
       });
     }
   }
-})();
+}
+
+initPRNG();
diff --git a/packages/taler-wallet-core/tsconfig.json b/packages/taler-wallet-core/tsconfig.json
index c8f5c23b2..3da332364 100644
--- a/packages/taler-wallet-core/tsconfig.json
+++ b/packages/taler-wallet-core/tsconfig.json
@@ -4,7 +4,7 @@
     "composite": true,
     "declaration": true,
     "declarationMap": false,
-    "target": "ES6",
+    "target": "ES2017",
     "module": "ESNext",
     "moduleResolution": "node",
     "sourceMap": true,
@@ -21,7 +21,7 @@
     "esModuleInterop": true,
     "importHelpers": true,
     "rootDir": "./src",
-    "typeRoots": ["./node_modules/@types"]
+    "typeRoots": ["./node_modules/@types"],
   },
   "references": [
     {