diff --git a/README.md b/README.md
index 412c69a..18eff2d 100644
--- a/README.md
+++ b/README.md
@@ -42,8 +42,7 @@ Using obj2gltf as a command-line tool:
 |`-n`, `--generateNormals`|Generate normals if they are missing.|No, default `false`|
 |`--optimizeForCesium`|Optimize the glTF for Cesium by using the sun as a default light source.|No, default `false`|
 |`--ao`|Apply ambient occlusion to the converted model.|No, default `false`|
-|`--kmc`|Output glTF with the KHR_materials_common extension.|No, default `false`|
-|`--bypassPipeline`|Bypass the gltf-pipeline for debugging purposes. This option overrides many of the options above and will save the glTF with the KHR_materials_common extension.|No, default `false`|
+|`--bypassPipeline`|Bypass the gltf-pipeline for debugging purposes. This option overrides many of the options above.|No, default `false`|
 |`--checkTransparency`|Do a more exhaustive check for texture transparency by looking at the alpha channel of each pixel. By default textures are considered to be opaque.|No, default `false`|
 |`--secure`|Prevent the converter from reading image or mtl files outside of the input obj directory.|No, default `false`|
 
diff --git a/bin/obj2gltf.js b/bin/obj2gltf.js
index 8e77725..cf7204f 100644
--- a/bin/obj2gltf.js
+++ b/bin/obj2gltf.js
@@ -76,13 +76,8 @@ var argv = yargs
             type: 'boolean',
             default: defaults.ao
         },
-        kmc : {
-            describe: 'Output glTF with the KHR_materials_common extension.',
-            type: 'boolean',
-            default: defaults.kmc
-        },
         bypassPipeline : {
-            describe: 'Bypass the gltf-pipeline for debugging purposes. This option overrides many of the options above and will save the glTF with the KHR_materials_common extension.',
+            describe: 'Bypass the gltf-pipeline for debugging purposes. This option overrides many of the options above.',
             type: 'boolean',
             default: defaults.bypassPipeline
         },
@@ -116,7 +111,6 @@ var options = {
     optimizeForCesium : argv.optimizeForCesium,
     generateNormals : argv.generateNormals,
     ao : argv.ao,
-    kmc : argv.kmc,
     bypassPipeline : argv.bypassPipeline,
     checkTransparency : argv.checkTransparency,
     secure : argv.secure
diff --git a/lib/obj2gltf.js b/lib/obj2gltf.js
index eeffc24..c362989 100644
--- a/lib/obj2gltf.js
+++ b/lib/obj2gltf.js
@@ -31,9 +31,8 @@ module.exports = obj2gltf;
  * @param {Boolean} [options.optimizeForCesium=false] Optimize the glTF for Cesium by using the sun as a default light source.
  * @param {Boolean} [options.generateNormals=false] Generate normals if they are missing.
  * @param {Boolean} [options.ao=false] Apply ambient occlusion to the converted model.
- * @param {Boolean} [options.kmc=false] Output glTF with the KHR_materials_common extension.
  * @param {Boolean} [options.textureCompressionOptions] Options sent to the compressTextures stage of gltf-pipeline.
- * @param {Boolean} [options.bypassPipeline=false] Bypass the gltf-pipeline for debugging purposes. This option overrides many of the options above and will save the glTF with the KHR_materials_common extension.
+ * @param {Boolean} [options.bypassPipeline=false] Bypass the gltf-pipeline for debugging purposes. This option overrides many of the options above.
  * @param {Boolean} [options.checkTransparency=false] Do a more exhaustive check for texture transparency by looking at the alpha channel of each pixel.
  * @param {Boolean} [options.secure=false] Prevent the converter from reading image or mtl files outside of the input obj directory.
  * @param {Logger} [options.logger] A callback function for handling logged messages. Defaults to console.log.
@@ -50,7 +49,6 @@ function obj2gltf(objPath, gltfPath, options) {
     var optimizeForCesium = defaultValue(options.optimizeForCesium, defaults.optimizeForCesium);
     var generateNormals = defaultValue(options.generateNormals, defaults.generateNormals);
     var ao = defaultValue(options.ao, defaults.ao);
-    var kmc = defaultValue(options.kmc, defaults.kmc);
     var textureCompressionOptions = options.textureCompressionOptions;
     var bypassPipeline = defaultValue(options.bypassPipeline, defaults.bypassPipeline);
     var checkTransparency = defaultValue(options.checkTransparency, defaults.checkTransparency);
@@ -86,7 +84,6 @@ function obj2gltf(objPath, gltfPath, options) {
     gltfPath = path.join(path.dirname(gltfPath), modelName + extension);
 
     var aoOptions = ao ? {} : undefined;
-    var kmcOptions = kmc ? {} : undefined;
 
     var pipelineOptions = {
         createDirectory : false,
@@ -101,7 +98,6 @@ function obj2gltf(objPath, gltfPath, options) {
         optimizeForCesium : optimizeForCesium,
         smoothNormals : generateNormals,
         aoOptions : aoOptions,
-        kmcOptions : kmcOptions,
         textureCompressionOptions : textureCompressionOptions
     };
 
@@ -187,12 +183,6 @@ obj2gltf.defaults = {
      * @default false
      */
     ao: false,
-    /**
-     * Gets or sets whether the model will be saved with the KHR_materials_common extension.
-     * @type Boolean
-     * @default false
-     */
-    kmc: false,
     /**
      * Gets or sets whether the converter will bypass the gltf-pipeline for debugging purposes.
      * @type Boolean
diff --git a/specs/lib/obj2gltfSpec.js b/specs/lib/obj2gltfSpec.js
index b152f9f..e85d1b7 100644
--- a/specs/lib/obj2gltfSpec.js
+++ b/specs/lib/obj2gltfSpec.js
@@ -39,7 +39,6 @@ describe('obj2gltf', function() {
                     quantize : false,
                     compressTextureCoordinates : false,
                     aoOptions : undefined,
-                    kmcOptions : undefined,
                     smoothNormals : false,
                     optimizeForCesium : false,
                     textureCompressionOptions : undefined,
@@ -64,7 +63,6 @@ describe('obj2gltf', function() {
             optimizeForCesium : true,
             generateNormals : true,
             ao : true,
-            kmc : true,
             textureCompressionOptions : textureCompressionOptions,
             checkTransparency : true,
             secure : true,
@@ -85,7 +83,6 @@ describe('obj2gltf', function() {
                     quantize : true,
                     compressTextureCoordinates : true,
                     aoOptions : {},
-                    kmcOptions : {},
                     smoothNormals : true,
                     optimizeForCesium : true,
                     textureCompressionOptions : textureCompressionOptions,