diff --git a/src/index.js b/src/index.js
index 4c904b79..ad6cbcd8 100644
--- a/src/index.js
+++ b/src/index.js
@@ -24,6 +24,7 @@
 
 'use strict';
 
+const _ = require('lodash');
 const LicensePlugin = require('./license-plugin.js');
 
 module.exports = (options = {}) => {
@@ -59,6 +60,11 @@ module.exports = (options = {}) => {
         return;
       }
 
+      if (_.has(options, 'sourceMap') || _.has(options, 'sourcemap')) {
+        // SourceMap has been set on the plugin itself.
+        return;
+      }
+
       // Rollup >= 0.48 replace `sourceMap` with `sourcemap`.
       // If `sourcemap` is disabled globally, disable it on the plugin.
       if (opts.sourceMap === false || opts.sourcemap === false) {
diff --git a/src/license-plugin.js b/src/license-plugin.js
index 0c20d8a6..5dc1f0f9 100644
--- a/src/license-plugin.js
+++ b/src/license-plugin.js
@@ -48,12 +48,14 @@ class LicensePlugin {
     this.name = 'rollup-plugin-license';
 
     this._options = options;
-    this._sourceMap = true;
     this._cwd = process.cwd();
     this._dependencies = {};
     this._pkg = require(path.join(this._cwd, 'package.json'));
     this._debug = options.debug || false;
 
+    // SourceMap can now be disable/enable on the plugin.
+    this._sourceMap = options.sourceMap !== false && options.sourcemap !== false;
+
     // This is a cache storing a directory path to associated package.
     // This is an improvement to avoid looking for package information for
     // already scanned directory.
diff --git a/test/index.spec.js b/test/index.spec.js
index 73a2a949..56ffeae4 100644
--- a/test/index.spec.js
+++ b/test/index.spec.js
@@ -92,6 +92,30 @@ describe('rollup-plugin-license', () => {
     expect(LicensePlugin.prototype.disableSourceMap).toHaveBeenCalledWith();
   });
 
+  it('should not try to disable sourceMap if sourceMap is set in plugin options', () => {
+    spyOn(LicensePlugin.prototype, 'disableSourceMap').and.callThrough();
+
+    const instance = plugin({sourceMap: true});
+    const result = instance.options({
+      sourceMap: false,
+    });
+
+    expect(result).not.toBeDefined();
+    expect(LicensePlugin.prototype.disableSourceMap).not.toHaveBeenCalledWith();
+  });
+
+  it('should not try to disable sourceMap if sourcemap (lowercase) is set in plugin options', () => {
+    spyOn(LicensePlugin.prototype, 'disableSourceMap').and.callThrough();
+
+    const instance = plugin({sourcemap: true});
+    const result = instance.options({
+      sourceMap: false,
+    });
+
+    expect(result).not.toBeDefined();
+    expect(LicensePlugin.prototype.disableSourceMap).not.toHaveBeenCalledWith();
+  });
+
   it('should enable sourceMap by default', () => {
     spyOn(LicensePlugin.prototype, 'disableSourceMap').and.callThrough();
 
diff --git a/test/license-plugin.spec.js b/test/license-plugin.spec.js
index cb6e35e9..4ac1f0a0 100644
--- a/test/license-plugin.spec.js
+++ b/test/license-plugin.spec.js
@@ -46,6 +46,28 @@ describe('LicensePlugin', () => {
     expect(plugin._dependencies).toEqual({});
   });
 
+  it('should initialize instance with sourceMap = false', () => {
+    const plugin = new LicensePlugin({
+      sourceMap: false,
+    });
+
+    expect(plugin._cwd).toBeDefined();
+    expect(plugin._pkg).toBeDefined();
+    expect(plugin._sourceMap).toBe(false);
+    expect(plugin._dependencies).toEqual({});
+  });
+
+  it('should initialize instance with sourcemap = false (lowercase)', () => {
+    const plugin = new LicensePlugin({
+      sourcemap: false,
+    });
+
+    expect(plugin._cwd).toBeDefined();
+    expect(plugin._pkg).toBeDefined();
+    expect(plugin._sourceMap).toBe(false);
+    expect(plugin._dependencies).toEqual({});
+  });
+
   it('should disable source map', () => {
     const plugin = new LicensePlugin();
     expect(plugin._sourceMap).toBe(true);