4 files changed, 4 insertions, 4 deletions
diff --git a/packages/sol-resolver/src/resolvers/fallthrough_resolver.ts b/packages/sol-resolver/src/resolvers/fallthrough_resolver.ts
index 8f6af9be0..338f334f4 100644
--- a/packages/sol-resolver/src/resolvers/fallthrough_resolver.ts
+++ b/packages/sol-resolver/src/resolvers/fallthrough_resolver.ts
@@ -5,7 +5,7 @@ import { ContractSource } from '../types';
 import { Resolver } from './resolver';
 
 export class FallthroughResolver extends Resolver {
-    private _resolvers: Resolver[] = [];
+    private readonly _resolvers: Resolver[] = [];
     public appendResolver(resolver: Resolver): void {
         this._resolvers.push(resolver);
     }
diff --git a/packages/sol-resolver/src/resolvers/name_resolver.ts b/packages/sol-resolver/src/resolvers/name_resolver.ts
index bcd98615f..d6ac6a499 100644
--- a/packages/sol-resolver/src/resolvers/name_resolver.ts
+++ b/packages/sol-resolver/src/resolvers/name_resolver.ts
@@ -8,7 +8,7 @@ import { EnumerableResolver } from './enumerable_resolver';
 const SOLIDITY_FILE_EXTENSION = '.sol';
 
 export class NameResolver extends EnumerableResolver {
-    private _contractsDir: string;
+    private readonly _contractsDir: string;
     constructor(contractsDir: string) {
         super();
         this._contractsDir = contractsDir;
diff --git a/packages/sol-resolver/src/resolvers/npm_resolver.ts b/packages/sol-resolver/src/resolvers/npm_resolver.ts
index 2c0a44aad..9f8617145 100644
--- a/packages/sol-resolver/src/resolvers/npm_resolver.ts
+++ b/packages/sol-resolver/src/resolvers/npm_resolver.ts
@@ -6,7 +6,7 @@ import { ContractSource } from '../types';
 import { Resolver } from './resolver';
 
 export class NPMResolver extends Resolver {
-    private _packagePath: string;
+    private readonly _packagePath: string;
     constructor(packagePath: string) {
         super();
         this._packagePath = packagePath;
diff --git a/packages/sol-resolver/src/resolvers/relative_fs_resolver.ts b/packages/sol-resolver/src/resolvers/relative_fs_resolver.ts
index 2317ede83..77103b8c1 100644
--- a/packages/sol-resolver/src/resolvers/relative_fs_resolver.ts
+++ b/packages/sol-resolver/src/resolvers/relative_fs_resolver.ts
@@ -6,7 +6,7 @@ import { ContractSource } from '../types';
 import { Resolver } from './resolver';
 
 export class RelativeFSResolver extends Resolver {
-    private _contractsDir: string;
+    private readonly _contractsDir: string;
     constructor(contractsDir: string) {
         super();
         this._contractsDir = contractsDir;