diff --git a/packages/tao/src/commands/generate.ts b/packages/tao/src/commands/generate.ts
index cba8079278..0ab5046844 100644
--- a/packages/tao/src/commands/generate.ts
+++ b/packages/tao/src/commands/generate.ts
@@ -27,7 +27,10 @@ import {
   convertToCamelCase,
   handleErrors,
   Schema,
-  validateOptions,
+  Options,
+  lookupUnmatched,
+  convertAliases,
+  coerceTypes,
 } from '../shared/params';
 import { commandName, printHelp } from '../shared/print-help';
 // @ts-ignore
@@ -317,7 +320,7 @@ async function runSchematic(
   const record = { loggingQueue: [] as string[], error: false };
   workflow.reporter.subscribe(createRecorder(record, logger));
 
-  const schematicOptions = validateOptions(
+  const schematicOptions = normalizeOptions(
     opts.schematicOptions,
     flattenedSchema
   );
@@ -421,6 +424,13 @@ export async function taoNew(
   });
 }
 
+function normalizeOptions(opts: Options, schema: Schema): Options {
+  return lookupUnmatched(
+    convertAliases(coerceTypes(opts, schema), schema, true),
+    schema
+  );
+}
+
 function isTTY(): boolean {
   return !!process.stdout.isTTY && process.env['CI'] !== 'true';
 }
diff --git a/packages/tao/src/commands/run.ts b/packages/tao/src/commands/run.ts
index 416d4af7b8..a348e4c0ca 100644
--- a/packages/tao/src/commands/run.ts
+++ b/packages/tao/src/commands/run.ts
@@ -10,9 +10,11 @@ import {
 import { NodeJsSyncHost } from '@angular-devkit/core/node';
 import { getLogger } from '../shared/logger';
 import {
-  coerceTypesAndNormalizeAliases,
+  coerceTypes,
+  convertAliases,
   convertToCamelCase,
   handleErrors,
+  Options,
   Schema,
 } from '../shared/params';
 import { commandName, printHelp } from '../shared/print-help';
@@ -175,7 +177,7 @@ export async function run(root: string, args: string[], isVerbose: boolean) {
       return 0;
     }
 
-    const runOptions = coerceTypesAndNormalizeAliases(
+    const runOptions = normalizeOptions(
       opts.runOptions,
       flattenedSchema as any
     );
@@ -193,3 +195,7 @@ export async function run(root: string, args: string[], isVerbose: boolean) {
     return result.success ? 0 : 1;
   });
 }
+
+function normalizeOptions(opts: Options, schema: Schema): Options {
+  return convertAliases(coerceTypes(opts, schema), schema, false);
+}
diff --git a/packages/tao/src/shared/params.spec.ts b/packages/tao/src/shared/params.spec.ts
index b8bd6438c2..8b1d7c59f8 100644
--- a/packages/tao/src/shared/params.spec.ts
+++ b/packages/tao/src/shared/params.spec.ts
@@ -97,12 +97,13 @@ describe('params', () => {
             properties: { directory: { type: 'string', alias: 'd' } },
             required: [],
             description: '',
-          }
+          },
+          true
         )
       ).toEqual({ directory: 'test' });
     });
 
-    it('should filter unknown keys into the leftovers field', () => {
+    it('should filter unknown keys into the leftovers field when excludeUnmatched is true', () => {
       expect(
         convertAliases(
           { d: 'test' },
@@ -110,7 +111,8 @@ describe('params', () => {
             properties: { directory: { type: 'string' } },
             required: [],
             description: '',
-          }
+          },
+          true
         )
       ).toEqual({
         '--': [
@@ -121,6 +123,22 @@ describe('params', () => {
         ],
       });
     });
+
+    it('should not filter unknown keys into the leftovers field when excludeUnmatched is false', () => {
+      expect(
+        convertAliases(
+          { d: 'test' },
+          {
+            properties: { directory: { type: 'string' } },
+            required: [],
+            description: '',
+          },
+          false
+        )
+      ).toEqual({
+        d: 'test',
+      });
+    });
   });
 
   describe('lookupUnmatched', () => {
diff --git a/packages/tao/src/shared/params.ts b/packages/tao/src/shared/params.ts
index d4b000bb3d..b5ded896b9 100644
--- a/packages/tao/src/shared/params.ts
+++ b/packages/tao/src/shared/params.ts
@@ -83,7 +83,11 @@ export function coerceTypes(opts: Options, schema: Schema): Options {
  * @param opts The options passed in by the user
  * @param schema The schema definition to check against
  */
-export function convertAliases(opts: Options, schema: Schema): Options {
+export function convertAliases(
+  opts: Options,
+  schema: Schema,
+  excludeUnmatched: boolean
+): Options {
   return Object.keys(opts).reduce((acc, k) => {
     if (schema.properties[k]) {
       acc[k] = opts[k];
@@ -93,7 +97,7 @@ export function convertAliases(opts: Options, schema: Schema): Options {
       );
       if (found) {
         acc[found[0]] = opts[k];
-      } else {
+      } else if (excludeUnmatched) {
         if (!acc['--']) {
           acc['--'] = [];
         }
@@ -101,6 +105,8 @@ export function convertAliases(opts: Options, schema: Schema): Options {
           name: k,
           possible: [],
         });
+      } else {
+        acc[k] = opts[k];
       }
     }
     return acc;
@@ -126,26 +132,3 @@ export function lookupUnmatched(opts: Options, schema: Schema): Options {
   }
   return opts;
 }
-
-export function coerceTypesAndNormalizeAliases(
-  opts: Options,
-  schema: Schema
-): Options {
-  return convertAliases(coerceTypes(opts, schema), schema);
-}
-
-/**
- * Converts aliases and coerces types according to the schema
- *
- * @param opts The options to check
- * @param schema The schema definition to validate against
- *
- * @remarks
- *
- * Unmatched options are added to opts['--']
- * and listed along with possible schema matches
- *
- */
-export function validateOptions(opts: Options, schema: Schema): Options {
-  return lookupUnmatched(coerceTypesAndNormalizeAliases(opts, schema), schema);
-}