diff --git a/servo/components/malloc_size_of/Cargo.toml b/servo/components/malloc_size_of/Cargo.toml
index ab8879ea8686..82ad7a7ef2f2 100644
--- a/servo/components/malloc_size_of/Cargo.toml
+++ b/servo/components/malloc_size_of/Cargo.toml
@@ -21,10 +21,12 @@ servo = [
     "url",
     "webrender_api",
     "xml5ever",
+    "content-security-policy",
 ]
 
 [dependencies]
 app_units = "0.7"
+content-security-policy = {version = "0.3.0", features = ["serde"], optional = true}
 crossbeam-channel = { version = "0.3", optional = true }
 cssparser = "0.25"
 euclid = "0.20"
diff --git a/servo/components/malloc_size_of/lib.rs b/servo/components/malloc_size_of/lib.rs
index d7e0a6fdf165..1d5cbeaff1e2 100644
--- a/servo/components/malloc_size_of/lib.rs
+++ b/servo/components/malloc_size_of/lib.rs
@@ -48,6 +48,8 @@
 
 extern crate app_units;
 #[cfg(feature = "servo")]
+extern crate content_security_policy;
+#[cfg(feature = "servo")]
 extern crate crossbeam_channel;
 extern crate cssparser;
 extern crate euclid;
@@ -79,6 +81,8 @@ extern crate webrender_api;
 #[cfg(feature = "servo")]
 extern crate xml5ever;
 
+#[cfg(feature = "servo")]
+use content_security_policy as csp;
 #[cfg(feature = "servo")]
 use serde_bytes::ByteBuf;
 use std::hash::{BuildHasher, Hash};
@@ -833,6 +837,9 @@ malloc_size_of_is_0!(app_units::Au);
 
 malloc_size_of_is_0!(cssparser::RGBA, cssparser::TokenSerializationType);
 
+#[cfg(feature = "servo")]
+malloc_size_of_is_0!(csp::Destination);
+
 #[cfg(feature = "url")]
 impl MallocSizeOf for url::Host {
     fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {