diff --git a/packages/wasm-crypto/src/initNone.ts b/packages/wasm-crypto/src/initNone.ts
index cffae4d6..a0e5d9c8 100644
--- a/packages/wasm-crypto/src/initNone.ts
+++ b/packages/wasm-crypto/src/initNone.ts
@@ -9,4 +9,6 @@ export async function initWasm (): Promise<void> {
   await initBridge(createWasm);
 }
 
-initWasm().catch(undefined);
+initWasm().catch((): void => {
+  // cannot happen, initWasm doesn't throw
+});
diff --git a/packages/wasm-crypto/src/initOnlyAsm.ts b/packages/wasm-crypto/src/initOnlyAsm.ts
index e6030497..45772bd5 100644
--- a/packages/wasm-crypto/src/initOnlyAsm.ts
+++ b/packages/wasm-crypto/src/initOnlyAsm.ts
@@ -9,4 +9,6 @@ export async function initWasm (): Promise<void> {
   await initBridge(createWasm);
 }
 
-initWasm().catch(undefined);
+initWasm().catch((): void => {
+  // cannot happen, initWasm doesn't throw
+});
diff --git a/packages/wasm-crypto/src/initOnlyWasm.ts b/packages/wasm-crypto/src/initOnlyWasm.ts
index 52e77ab0..09e48da6 100644
--- a/packages/wasm-crypto/src/initOnlyWasm.ts
+++ b/packages/wasm-crypto/src/initOnlyWasm.ts
@@ -9,4 +9,6 @@ export async function initWasm (): Promise<void> {
   await initBridge(createWasm);
 }
 
-initWasm().catch(undefined);
+initWasm().catch((): void => {
+  // cannot happen, initWasm doesn't throw
+});
diff --git a/packages/wasm-crypto/src/initWasmAsm.ts b/packages/wasm-crypto/src/initWasmAsm.ts
index 012a5771..86cc1b58 100644
--- a/packages/wasm-crypto/src/initWasmAsm.ts
+++ b/packages/wasm-crypto/src/initWasmAsm.ts
@@ -9,4 +9,6 @@ export async function initWasm (): Promise<void> {
   await initBridge(createWasm);
 }
 
-initWasm().catch(undefined);
+initWasm().catch((): void => {
+  // cannot happen, initWasm doesn't throw
+});