diff --git a/components/style/values/specified/image.rs b/components/style/values/specified/image.rs
index 0e55d18d079..f2167e52800 100644
--- a/components/style/values/specified/image.rs
+++ b/components/style/values/specified/image.rs
@@ -81,6 +81,16 @@ fn cross_fade_enabled() -> bool {
     false
 }
 
+#[cfg(feature = "gecko")]
+fn image_set_enabled() -> bool {
+    true
+}
+
+#[cfg(feature = "servo")]
+fn image_set_enabled() -> bool {
+    false
+}
+
 impl SpecifiedValueInfo for Gradient {
     const SUPPORTED_TYPES: u8 = CssType::GRADIENT;
 
@@ -122,7 +132,9 @@ impl<Image, Resolution> SpecifiedValueInfo for generic::ImageSet<Image, Resoluti
     const SUPPORTED_TYPES: u8 = 0;
 
     fn collect_completion_keywords(f: KeywordsCollectFn) {
-        f(&["image-set"]);
+        if image_set_enabled() {
+            f(&["image-set"]);
+        }
     }
 }
 
@@ -191,8 +203,10 @@ impl Image {
             return Ok(generic::Image::Url(url));
         }
 
-        if let Ok(is) = input.try_parse(|input| ImageSet::parse(context, input, cors_mode, only_url)) {
-            return Ok(generic::Image::ImageSet(Box::new(is)));
+        if image_set_enabled() {
+            if let Ok(is) = input.try_parse(|input| ImageSet::parse(context, input, cors_mode, only_url)) {
+                return Ok(generic::Image::ImageSet(Box::new(is)));
+            }
         }
 
         if only_url {