diff --git a/components/style/gecko/conversions.rs b/components/style/gecko/conversions.rs
index 42c146f7125f..631e5abb1ebd 100644
--- a/components/style/gecko/conversions.rs
+++ b/components/style/gecko/conversions.rs
@@ -101,12 +101,12 @@ impl From<nsStyleCoord_CalcValue> for LengthOrPercentage {
 
 impl nsStyleImage {
     /// Set a given Servo `Image` value into this `nsStyleImage`.
-    pub fn set(&mut self, image: Image, with_url: bool, cacheable: &mut bool) {
+    pub fn set(&mut self, image: Image, cacheable: &mut bool) {
         match image {
             Image::Gradient(gradient) => {
                 self.set_gradient(gradient)
             },
-            Image::Url(ref url) if with_url => {
+            Image::Url(ref url) => {
                 unsafe {
                     Gecko_SetUrlImageValue(self, url.for_ffi());
                     // We unfortunately must make any url() value uncacheable, since
@@ -119,7 +119,7 @@ impl nsStyleImage {
                     *cacheable = false;
                 }
             },
-            Image::ImageRect(ref image_rect) if with_url => {
+            Image::ImageRect(ref image_rect) => {
                 unsafe {
                     Gecko_SetUrlImageValue(self, image_rect.url.for_ffi());
                     Gecko_InitializeImageCropRect(self);
@@ -145,8 +145,7 @@ impl nsStyleImage {
                 unsafe {
                     Gecko_SetImageElement(self, element.as_ptr());
                 }
-            },
-            _ => (),
+            }
         }
     }
 
diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index 69b6cbf16720..9005fe691a43 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -944,7 +944,7 @@ fn static_assert() {
         }
 
         if let Some(image) = v.0 {
-            self.gecko.mBorderImageSource.set(image, true, &mut false)
+            self.gecko.mBorderImageSource.set(image, &mut false)
         }
     }
 
@@ -2764,12 +2764,12 @@ fn static_assert() {
                                                                 .mLayers.iter_mut()) {
             % if shorthand == "background":
                 if let Some(image) = image.0 {
-                    geckoimage.mImage.set(image, true, cacheable)
+                    geckoimage.mImage.set(image, cacheable)
                 }
             % else:
                 use properties::longhands::mask_image::single_value::computed_value::T;
                 match image {
-                    T::Image(image) => geckoimage.mImage.set(image, true, cacheable),
+                    T::Image(image) => geckoimage.mImage.set(image, cacheable),
                     _ => ()
                 }
             % endif