diff --git a/components/style/properties/longhands/border.mako.rs b/components/style/properties/longhands/border.mako.rs
index f4b9187b88a..2f455a1716b 100644
--- a/components/style/properties/longhands/border.mako.rs
+++ b/components/style/properties/longhands/border.mako.rs
@@ -112,6 +112,7 @@ ${helpers.predefined_type(
     animation_value_type="discrete",
     flags="APPLIES_TO_FIRST_LETTER",
     boxed=product == "servo",
+    ignored_when_colors_disabled=True
 )}
 
 ${helpers.predefined_type(
diff --git a/components/style/rule_tree/mod.rs b/components/style/rule_tree/mod.rs
index ff8c1cc86de..7277afd4d9f 100644
--- a/components/style/rule_tree/mod.rs
+++ b/components/style/rule_tree/mod.rs
@@ -1289,10 +1289,11 @@ impl StrongRuleNode {
         }
 
         // If author colors are not allowed, only claim to have author-specified
-        // rules if we're looking at a non-color property or if we're looking at
-        // the background color and it's set to transparent.
+        // rules if we're looking at a non-color property, a border image, or if
+        // we're looking at the background color and it's set to transparent.
         const IGNORED_WHEN_COLORS_DISABLED: &'static [LonghandId] = &[
             LonghandId::BackgroundImage,
+            LonghandId::BorderImageSource,
             LonghandId::BorderTopColor,
             LonghandId::BorderRightColor,
             LonghandId::BorderBottomColor,