diff --git a/android/guava/src/com/google/common/net/HttpHeaders.java b/android/guava/src/com/google/common/net/HttpHeaders.java
index a7f32afe4210..02490df845c3 100644
--- a/android/guava/src/com/google/common/net/HttpHeaders.java
+++ b/android/guava/src/com/google/common/net/HttpHeaders.java
@@ -720,6 +720,13 @@ private ReferrerPolicyValues() {}
    * @since 31.0
    */
   public static final String SEC_CH_UA_BITNESS = "Sec-CH-UA-Bitness";
+  /**
+   * The HTTP <a href="https://wicg.github.io/ua-client-hints/#sec-ch-ua-form-factor">{@code
+   * Sec-CH-UA-Form-Factor}</a> header field name.
+   *
+   * @since NEXT
+   */
+  public static final String SEC_CH_UA_FORM_FACTOR = "Sec-CH-UA-Form-Factor";
   /**
    * The HTTP <a
    * href="https://wicg.github.io/responsive-image-client-hints/#sec-ch-viewport-width">{@code
diff --git a/guava/src/com/google/common/net/HttpHeaders.java b/guava/src/com/google/common/net/HttpHeaders.java
index a7f32afe4210..02490df845c3 100644
--- a/guava/src/com/google/common/net/HttpHeaders.java
+++ b/guava/src/com/google/common/net/HttpHeaders.java
@@ -720,6 +720,13 @@ private ReferrerPolicyValues() {}
    * @since 31.0
    */
   public static final String SEC_CH_UA_BITNESS = "Sec-CH-UA-Bitness";
+  /**
+   * The HTTP <a href="https://wicg.github.io/ua-client-hints/#sec-ch-ua-form-factor">{@code
+   * Sec-CH-UA-Form-Factor}</a> header field name.
+   *
+   * @since NEXT
+   */
+  public static final String SEC_CH_UA_FORM_FACTOR = "Sec-CH-UA-Form-Factor";
   /**
    * The HTTP <a
    * href="https://wicg.github.io/responsive-image-client-hints/#sec-ch-viewport-width">{@code