diff --git a/serde/src/lib.rs b/serde/src/lib.rs
index 4cf0d735..5d814a62 100644
--- a/serde/src/lib.rs
+++ b/serde/src/lib.rs
@@ -130,9 +130,6 @@
 #[cfg(feature = "alloc")]
 extern crate alloc;
 
-#[cfg(all(feature = "unstable", feature = "std"))]
-extern crate core;
-
 /// A facade around all the types we need from the `std`, `core`, and `alloc`
 /// crates. This avoids elaborate import wrangling having to happen in every
 /// module.