diff --git a/components/style/gecko_bindings/structs_debug.rs b/components/style/gecko_bindings/structs_debug.rs
index f2d52e59283..322873f76a3 100644
--- a/components/style/gecko_bindings/structs_debug.rs
+++ b/components/style/gecko_bindings/structs_debug.rs
@@ -3042,6 +3042,7 @@ pub mod root {
         pub struct StyleComplexColor {
             pub mColor: root::nscolor,
             pub mForegroundRatio: u8,
+            pub mIsAuto: bool,
         }
         #[test]
         fn bindgen_test_layout_StyleComplexColor() {
diff --git a/components/style/gecko_bindings/structs_release.rs b/components/style/gecko_bindings/structs_release.rs
index 0ff3efce55f..ca933fb3eff 100644
--- a/components/style/gecko_bindings/structs_release.rs
+++ b/components/style/gecko_bindings/structs_release.rs
@@ -3024,6 +3024,7 @@ pub mod root {
         pub struct StyleComplexColor {
             pub mColor: root::nscolor,
             pub mForegroundRatio: u8,
+            pub mIsAuto: bool,
         }
         #[test]
         fn bindgen_test_layout_StyleComplexColor() {
diff --git a/components/style/gecko_bindings/sugar/style_complex_color.rs b/components/style/gecko_bindings/sugar/style_complex_color.rs
index 288d395b1ac..d428e6bf741 100644
--- a/components/style/gecko_bindings/sugar/style_complex_color.rs
+++ b/components/style/gecko_bindings/sugar/style_complex_color.rs
@@ -11,6 +11,7 @@ impl From<nscolor> for StyleComplexColor {
         StyleComplexColor {
             mColor: other,
             mForegroundRatio: 0,
+            mIsAuto: false,
         }
     }
 }
@@ -20,6 +21,15 @@ impl StyleComplexColor {
         StyleComplexColor {
             mColor: 0,
             mForegroundRatio: 255,
+            mIsAuto: false,
+        }
+    }
+
+    pub fn auto() -> Self {
+        StyleComplexColor {
+            mColor: 0,
+            mForegroundRatio: 255,
+            mIsAuto: true,
         }
     }
 }