diff --git a/src/normalize.rs b/src/normalize.rs
index 75431ea..b5493af 100644
--- a/src/normalize.rs
+++ b/src/normalize.rs
@@ -149,6 +149,10 @@ impl<'a> Filter<'a> {
                     // ::: $RUST/src/libstd/net/ip.rs:83:1
                     line.replace_range(line.find("::: ").unwrap() + 4..pos + 17, "$RUST");
                     other_crate = true;
+                } else if let Some(pos) = line.find("/rustlib/src/rust/library/") {
+                    // ::: $RUST/std/src/net/ip.rs:83:1
+                    line.replace_range(line.find("::: ").unwrap() + 4..pos + 25, "$RUST");
+                    other_crate = true;
                 }
             }
             if other_crate && self.normalization >= WorkspaceLines {
diff --git a/src/tests.rs b/src/tests.rs
index 0c881ce..38d40a7 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -54,6 +54,13 @@ error[E0599]: no method named `quote_into_iter` found for struct `std::net::Ipv4
    |
   ::: /rustlib/src/rust/src/libstd/net/ip.rs:83:1
    |
+83 | pub struct Ipv4Addr {
+   | -------------------
+   | |
+   | doesn't satisfy `std::net::Ipv4Addr: quote::to_tokens::ToTokens`
+   |
+  ::: /rustlib/src/rust/library/std/src/net/ip.rs:83:1
+   |
 83 | pub struct Ipv4Addr {
    | -------------------
    | |
@@ -71,6 +78,13 @@ error[E0599]: no method named `quote_into_iter` found for struct `std::net::Ipv4
    | -------------------
    | |
    | doesn't satisfy `std::net::Ipv4Addr: quote::to_tokens::ToTokens`
+   |
+  ::: $RUST/std/src/net/ip.rs
+   |
+   | pub struct Ipv4Addr {
+   | -------------------
+   | |
+   | doesn't satisfy `std::net::Ipv4Addr: quote::to_tokens::ToTokens`
 "}
 
 test_normalize! {test_type_dir_backslash "