diff --git a/components/style/values/specified/box.rs b/components/style/values/specified/box.rs
index 9e20e3a4f59..efdb65ff973 100644
--- a/components/style/values/specified/box.rs
+++ b/components/style/values/specified/box.rs
@@ -1346,12 +1346,12 @@ bitflags! {
         const LAYOUT = 1 << 2;
         /// `paint` variant, turns on paint containment
         const PAINT = 1 << 3;
-        /// `strict` variant, turns on all types of containment
-        const STRICT = 1 << 4 | Contain::LAYOUT.bits | Contain::PAINT.bits | Contain::SIZE.bits;
+        /// 'size' variant, turns on size containment
+        const SIZE = 1 << 4 | Contain::INLINE_SIZE.bits | Contain::BLOCK_SIZE.bits;
         /// `content` variant, turns on layout and paint containment
         const CONTENT = 1 << 5 | Contain::LAYOUT.bits | Contain::PAINT.bits;
-        /// 'size' variant, turns on size containment
-        const SIZE = 1 << 6 | Contain::INLINE_SIZE.bits | Contain::BLOCK_SIZE.bits;
+        /// `strict` variant, turns on all types of containment
+        const STRICT = 1 << 6 | Contain::LAYOUT.bits | Contain::PAINT.bits | Contain::SIZE.bits;
     }
 }