diff --git a/packages/permission-controller/src/rpc-methods/getPermissions.test.ts b/packages/permission-controller/src/rpc-methods/getPermissions.test.ts
index 99e0d02c48..f7724f4617 100644
--- a/packages/permission-controller/src/rpc-methods/getPermissions.test.ts
+++ b/packages/permission-controller/src/rpc-methods/getPermissions.test.ts
@@ -14,13 +14,16 @@ describe('getPermissions RPC method', () => {
 
     const engine = new JsonRpcEngine();
     engine.push(
-      async (
+      (
         req: JsonRpcRequest<[]>,
         res: PendingJsonRpcResponse<PermissionConstraint[]>,
         next,
         end,
       ) => {
-        await implementation(req, res, next, end, {
+        // We intentionally do not await this promise; JsonRpcEngine won't await
+        // middleware anyway.
+        // eslint-disable-next-line @typescript-eslint/no-floating-promises
+        implementation(req, res, next, end, {
           getPermissionsForOrigin: mockGetPermissionsForOrigin,
         });
       },
@@ -44,13 +47,16 @@ describe('getPermissions RPC method', () => {
 
     const engine = new JsonRpcEngine();
     engine.push(
-      async (
+      (
         req: JsonRpcRequest<[]>,
         res: PendingJsonRpcResponse<PermissionConstraint[]>,
         next,
         end,
       ) => {
-        await implementation(req, res, next, end, {
+        // We intentionally do not await this promise; JsonRpcEngine won't await
+        // middleware anyway.
+        // eslint-disable-next-line @typescript-eslint/no-floating-promises
+        implementation(req, res, next, end, {
           getPermissionsForOrigin: mockGetPermissionsForOrigin,
         });
       },
diff --git a/packages/permission-controller/src/rpc-methods/requestPermissions.test.ts b/packages/permission-controller/src/rpc-methods/requestPermissions.test.ts
index 6d467910d1..77dfc93ae5 100644
--- a/packages/permission-controller/src/rpc-methods/requestPermissions.test.ts
+++ b/packages/permission-controller/src/rpc-methods/requestPermissions.test.ts
@@ -32,8 +32,11 @@ describe('requestPermissions RPC method', () => {
 
     const engine = new JsonRpcEngine();
     engine.push<[RequestedPermissions], PermissionConstraint[]>(
-      async (req, res, next, end) => {
-        await implementation(req, res, next, end, {
+      (req, res, next, end) => {
+        // We intentionally do not await this promise; JsonRpcEngine won't await
+        // middleware anyway.
+        // eslint-disable-next-line @typescript-eslint/no-floating-promises
+        implementation(req, res, next, end, {
           requestPermissionsForOrigin: mockRequestPermissionsForOrigin,
         });
       },
@@ -102,8 +105,11 @@ describe('requestPermissions RPC method', () => {
 
     const engine = new JsonRpcEngine();
     engine.push<[RequestedPermissions], PermissionConstraint[]>(
-      async (req, res, next, end) => {
-        await implementation(req, res, next, end, {
+      (req, res, next, end) => {
+        // We intentionally do not await this promise; JsonRpcEngine won't await
+        // middleware anyway.
+        // eslint-disable-next-line @typescript-eslint/no-floating-promises
+        implementation(req, res, next, end, {
           requestPermissionsForOrigin: mockRequestPermissionsForOrigin,
         });
       },
diff --git a/packages/permission-controller/src/rpc-methods/revokePermissions.test.ts b/packages/permission-controller/src/rpc-methods/revokePermissions.test.ts
index 8a77226df5..5d9a9fdc21 100644
--- a/packages/permission-controller/src/rpc-methods/revokePermissions.test.ts
+++ b/packages/permission-controller/src/rpc-methods/revokePermissions.test.ts
@@ -27,8 +27,11 @@ describe('revokePermissions RPC method', () => {
     const mockRevokePermissionsForOrigin = jest.fn();
 
     const engine = new JsonRpcEngine();
-    engine.push<RevokePermissionArgs, null>(async (req, res, next, end) => {
-      await implementation(req, res, next, end, {
+    engine.push<RevokePermissionArgs, null>((req, res, next, end) => {
+      // We intentionally do not await this promise; JsonRpcEngine won't await
+      // middleware anyway.
+      // eslint-disable-next-line @typescript-eslint/no-floating-promises
+      implementation(req, res, next, end, {
         revokePermissionsForOrigin: mockRevokePermissionsForOrigin,
       });
     });
@@ -57,8 +60,11 @@ describe('revokePermissions RPC method', () => {
     const mockRevokePermissionsForOrigin = jest.fn();
 
     const engine = new JsonRpcEngine();
-    engine.push<RevokePermissionArgs, null>(async (req, res, next, end) => {
-      await implementation(req, res, next, end, {
+    engine.push<RevokePermissionArgs, null>((req, res, next, end) => {
+      // We intentionally do not await this promise; JsonRpcEngine won't await
+      // middleware anyway.
+      // eslint-disable-next-line @typescript-eslint/no-floating-promises
+      implementation(req, res, next, end, {
         revokePermissionsForOrigin: mockRevokePermissionsForOrigin,
       });
     });
@@ -91,8 +97,11 @@ describe('revokePermissions RPC method', () => {
     const mockRevokePermissionsForOrigin = jest.fn();
 
     const engine = new JsonRpcEngine();
-    engine.push<RevokePermissionArgs, null>(async (req, res, next, end) => {
-      await implementation(req, res, next, end, {
+    engine.push<RevokePermissionArgs, null>((req, res, next, end) => {
+      // We intentionally do not await this promise; JsonRpcEngine won't await
+      // middleware anyway.
+      // eslint-disable-next-line @typescript-eslint/no-floating-promises
+      implementation(req, res, next, end, {
         revokePermissionsForOrigin: mockRevokePermissionsForOrigin,
       });
     });
@@ -125,8 +134,11 @@ describe('revokePermissions RPC method', () => {
     const mockRevokePermissionsForOrigin = jest.fn();
 
     const engine = new JsonRpcEngine();
-    engine.push<RevokePermissionArgs, null>(async (req, res, next, end) => {
-      await implementation(req, res, next, end, {
+    engine.push<RevokePermissionArgs, null>((req, res, next, end) => {
+      // We intentionally do not await this promise; JsonRpcEngine won't await
+      // middleware anyway.
+      // eslint-disable-next-line @typescript-eslint/no-floating-promises
+      implementation(req, res, next, end, {
         revokePermissionsForOrigin: mockRevokePermissionsForOrigin,
       });
     });
@@ -158,8 +170,11 @@ describe('revokePermissions RPC method', () => {
     const mockRevokePermissionsForOrigin = jest.fn();
 
     const engine = new JsonRpcEngine();
-    engine.push<RevokePermissionArgs, null>(async (req, res, next, end) => {
-      await implementation(req, res, next, end, {
+    engine.push<RevokePermissionArgs, null>((req, res, next, end) => {
+      // We intentionally do not await this promise; JsonRpcEngine won't await
+      // middleware anyway.
+      // eslint-disable-next-line @typescript-eslint/no-floating-promises
+      implementation(req, res, next, end, {
         revokePermissionsForOrigin: mockRevokePermissionsForOrigin,
       });
     });