diff --git a/components/style/Cargo.toml b/components/style/Cargo.toml
index 4fb50d8ad85f2..df1562bed7239 100644
--- a/components/style/Cargo.toml
+++ b/components/style/Cargo.toml
@@ -19,9 +19,20 @@ doctest = false
 gecko = ["num_cpus",
          "style_traits/gecko", "fallible/known_system_malloc"]
 use_bindgen = ["bindgen", "regex", "toml"]
-servo = ["serde", "style_traits/servo", "servo_atoms", "servo_config", "html5ever",
-         "cssparser/serde", "encoding_rs", "malloc_size_of/servo", "arrayvec/use_union",
-         "servo_url", "string_cache"]
+servo = [
+  "serde",
+  "style_traits/servo",
+  "servo_atoms",
+  "servo_config",
+  "html5ever",
+  "cssparser/serde",
+  "cssparser/dummy_match_byte", # FIXME(#21038)
+  "encoding_rs",
+  "malloc_size_of/servo",
+  "arrayvec/use_union",
+  "servo_url",
+  "string_cache",
+]
 gecko_debug = []
 
 [dependencies]