diff --git a/js/rust/build.rs b/js/rust/build.rs
index af8de6969d8c..d5ae2efc572f 100644
--- a/js/rust/build.rs
+++ b/js/rust/build.rs
@@ -143,7 +143,8 @@ const UNSAFE_IMPL_SYNC_TYPES: &'static [&'static str] = &[
 /// Flags passed through bindgen directly to Clang.
 const EXTRA_CLANG_FLAGS: &'static [&'static str] = &[
     "-x", "c++",
-    "-std=c++14",
+    "-std=gnu++14",
+    "-fno-sized-deallocation",
     "-DRUST_BINDGEN",
 ];
 
diff --git a/layout/style/ServoBindings.toml b/layout/style/ServoBindings.toml
index aafd633fd1df..497007aafed1 100644
--- a/layout/style/ServoBindings.toml
+++ b/layout/style/ServoBindings.toml
@@ -1,6 +1,6 @@
 [build]
 args = [
-    "-x", "c++", "-std=c++14",
+    "-x", "c++", "-std=c++14", "-fno-sized-deallocation",
     "-DTRACING=1", "-DIMPL_LIBXUL", "-DMOZ_STYLO_BINDINGS=1",
     "-DMOZILLA_INTERNAL_API", "-DRUST_BINDGEN", "-DMOZ_STYLO"
 ]