diff --git a/fab/_fab.scss b/fab/_fab.scss
index 7637f01234..ecfc1e5f4b 100644
--- a/fab/_fab.scss
+++ b/fab/_fab.scss
@@ -3,5 +3,5 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-@forward './lib/fab-branded' as branded-* show branded-theme;
-@forward './lib/fab' show theme;
+@forward './internal/fab-branded' as branded-* show branded-theme;
+@forward './internal/fab' show theme;
diff --git a/fab/branded-fab.ts b/fab/branded-fab.ts
index 343a53afef..9f87feee26 100644
--- a/fab/branded-fab.ts
+++ b/fab/branded-fab.ts
@@ -6,12 +6,12 @@
 
 import {customElement} from 'lit/decorators.js';
 
-import {Fab, FabVariant} from './lib/fab.js';
-import {styles} from './lib/fab-branded-styles.css.js';
-import {styles as forcedColors} from './lib/forced-colors-styles.css.js';
-import {styles as sharedStyles} from './lib/shared-styles.css.js';
+import {Fab, FabVariant} from './internal/fab.js';
+import {styles} from './internal/fab-branded-styles.css.js';
+import {styles as forcedColors} from './internal/forced-colors-styles.css.js';
+import {styles as sharedStyles} from './internal/shared-styles.css.js';
 
-export {FabSize} from './lib/shared.js';
+export {FabSize} from './internal/shared.js';
 
 declare global {
   interface HTMLElementTagNameMap {
diff --git a/fab/fab.ts b/fab/fab.ts
index b1f20fd1de..62410bc5fd 100644
--- a/fab/fab.ts
+++ b/fab/fab.ts
@@ -6,13 +6,13 @@
 
 import {customElement} from 'lit/decorators.js';
 
-import {Fab} from './lib/fab.js';
-import {styles} from './lib/fab-styles.css.js';
-import {styles as forcedColors} from './lib/forced-colors-styles.css.js';
-import {styles as sharedStyles} from './lib/shared-styles.css.js';
+import {Fab} from './internal/fab.js';
+import {styles} from './internal/fab-styles.css.js';
+import {styles as forcedColors} from './internal/forced-colors-styles.css.js';
+import {styles as sharedStyles} from './internal/shared-styles.css.js';
 
-export {FabVariant} from './lib/fab.js';
-export {FabSize} from './lib/shared.js';
+export {FabVariant} from './internal/fab.js';
+export {FabSize} from './internal/shared.js';
 
 declare global {
   interface HTMLElementTagNameMap {
diff --git a/fab/harness.ts b/fab/harness.ts
index 268874d801..1999647133 100644
--- a/fab/harness.ts
+++ b/fab/harness.ts
@@ -6,7 +6,7 @@
 
 import {Harness} from '../testing/harness.js';
 
-import {Fab} from './lib/fab.js';
+import {Fab} from './internal/fab.js';
 
 /**
  * Test harness for floating action buttons.
diff --git a/fab/lib/_fab-branded.scss b/fab/internal/_fab-branded.scss
similarity index 100%
rename from fab/lib/_fab-branded.scss
rename to fab/internal/_fab-branded.scss
diff --git a/fab/lib/_fab.scss b/fab/internal/_fab.scss
similarity index 100%
rename from fab/lib/_fab.scss
rename to fab/internal/_fab.scss
diff --git a/fab/lib/_shared.scss b/fab/internal/_shared.scss
similarity index 100%
rename from fab/lib/_shared.scss
rename to fab/internal/_shared.scss
diff --git a/fab/lib/fab-branded-styles.scss b/fab/internal/fab-branded-styles.scss
similarity index 100%
rename from fab/lib/fab-branded-styles.scss
rename to fab/internal/fab-branded-styles.scss
diff --git a/fab/lib/fab-styles.scss b/fab/internal/fab-styles.scss
similarity index 100%
rename from fab/lib/fab-styles.scss
rename to fab/internal/fab-styles.scss
diff --git a/fab/lib/fab.ts b/fab/internal/fab.ts
similarity index 100%
rename from fab/lib/fab.ts
rename to fab/internal/fab.ts
diff --git a/fab/lib/forced-colors-styles.scss b/fab/internal/forced-colors-styles.scss
similarity index 100%
rename from fab/lib/forced-colors-styles.scss
rename to fab/internal/forced-colors-styles.scss
diff --git a/fab/lib/shared-styles.scss b/fab/internal/shared-styles.scss
similarity index 100%
rename from fab/lib/shared-styles.scss
rename to fab/internal/shared-styles.scss
diff --git a/fab/lib/shared.ts b/fab/internal/shared.ts
similarity index 100%
rename from fab/lib/shared.ts
rename to fab/internal/shared.ts