diff --git a/src/config.ts b/src/config.ts
new file mode 100644
index 0000000..e0c5cd0
--- /dev/null
+++ b/src/config.ts
@@ -0,0 +1,39 @@
+import * as path from 'path';
+import * as vscode from 'vscode';
+import * as cp from 'child_process';
+
+const DEFAULT_PROTO_LINT_PATH = 'protolint';
+
+let config: { protoLintPath?: string } = {
+  protoLintPath: undefined
+};
+
+export function reloadConfig(): boolean {
+  config.protoLintPath = resolveProtoLintPath();
+
+  // Verify that protolint can be successfully executed on the host machine by running the version command.
+  // In the event the binary cannot be executed, tell the user where to download protolint from.
+  const result = cp.spawnSync(config.protoLintPath, ['version']);
+  if (result.status !== 0) {
+    vscode.window.showErrorMessage("protolint was not detected using path `" + config.protoLintPath + "`. Download from: https://github.com/yoheimuta/protolint");
+    return false;
+  }
+
+  return true;
+}
+
+export function getConfig() {
+  return config;
+}
+
+function resolveProtoLintPath(): string {
+  let p = vscode.workspace.getConfiguration('protolint').get<string>('path');
+
+  if (!p || p === DEFAULT_PROTO_LINT_PATH) {
+    return DEFAULT_PROTO_LINT_PATH;
+  } else if (!path.isAbsolute(p) && vscode.workspace.workspaceFolders) {
+    return path.join(vscode.workspace.workspaceFolders[0].uri.fsPath, p);
+  } else {
+    return p;
+  }
+}
diff --git a/src/extension.ts b/src/extension.ts
index b90abf0..2d28d76 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1,6 +1,6 @@
 import * as vscode from 'vscode';
-import * as cp from 'child_process';
 import Linter, { LinterError } from './linter';
+import { reloadConfig } from './config';
 
 const diagnosticCollection = vscode.languages.createDiagnosticCollection("protolint");
 
@@ -17,16 +17,13 @@ export function activate(context: vscode.ExtensionContext) {
     vscode.commands.executeCommand('protolint.lint');
   });
 
-  // Verify that protolint can be successfully executed on the host machine by running the version command.
-  // In the event the binary cannot be executed, tell the user where to download protolint from.
-  let protoLintPath = vscode.workspace.getConfiguration('protolint').get<string>('path');
-  if (!protoLintPath) {
-    protoLintPath = "protolint"
-  }
+  vscode.workspace.onDidChangeConfiguration((e: vscode.ConfigurationChangeEvent) => {
+    if (e.affectsConfiguration('protolint')) {
+      reloadConfig();
+    }
+  });
 
-  const result = cp.spawnSync(protoLintPath, ['version']);
-  if (result.status !== 0) {
-    vscode.window.showErrorMessage("protolint was not detected using path `" + protoLintPath + "`. Download from: https://github.com/yoheimuta/protolint");
+  if (!reloadConfig()) {
     return;
   }
 }
@@ -34,7 +31,7 @@ export function activate(context: vscode.ExtensionContext) {
 function runLint() {
   let editor = vscode.window.activeTextEditor;
   if (!editor) {
-      return;
+    return;
   }
 
   // We only want to run protolint on documents that are known to be
diff --git a/src/linter.ts b/src/linter.ts
index 35a2c51..1b15abb 100644
--- a/src/linter.ts
+++ b/src/linter.ts
@@ -3,6 +3,7 @@ import * as vscode from 'vscode';
 import * as util from 'util';
 import * as path from 'path';
 
+import { getConfig } from './config';
 import { ProtoError, parseProtoError } from './protoError';
 
 export interface LinterError {
@@ -44,11 +45,7 @@ export default class Linter {
     let currentFile = this.codeDocument.uri.fsPath;
     let currentDirectory = path.dirname(currentFile);
 
-    let protoLintPath = vscode.workspace.getConfiguration('protolint').get<string>('path');
-    if (!protoLintPath) {
-      protoLintPath = "protolint"
-    }
-
+    let { protoLintPath } = getConfig();
     const cmd = `${protoLintPath} lint "${currentFile}"`;
 
     // Execute the protolint binary and store the output from standard error.