diff --git a/components/style/Cargo.toml b/components/style/Cargo.toml
index 6ea87409078..4c42919be8b 100644
--- a/components/style/Cargo.toml
+++ b/components/style/Cargo.toml
@@ -20,6 +20,7 @@ servo = ["serde/unstable", "serde", "serde_derive", "heapsize", "heapsize_derive
          "cssparser/heapsize", "cssparser/serde", "encoding",
          "rayon/unstable", "servo_url"]
 testing = []
+gecko_debug = []
 
 [dependencies]
 app_units = "0.4"
diff --git a/ports/geckolib/Cargo.toml b/ports/geckolib/Cargo.toml
index b035f7c496e..8148aa27ab9 100644
--- a/ports/geckolib/Cargo.toml
+++ b/ports/geckolib/Cargo.toml
@@ -12,6 +12,7 @@ crate-type = ["staticlib", "rlib"]
 [features]
 bindgen = ["style/use_bindgen"]
 testing = ["style/testing"]
+gecko_debug = ["style/gecko_debug"]
 
 [dependencies]
 atomic_refcell = "0.1"