diff --git a/Cargo.toml b/Cargo.toml
index 1e9230b0..53a949b5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,9 +21,6 @@ lazy_static = "1.0"
 # Used when testing out serde support.
 bincode = {version = "1.1.3"}
 
-[build-dependencies]
-autocfg = "0.1.6"
-
 [features]
 default = []
 owning_ref = ["lock_api/owning_ref"]
diff --git a/core/Cargo.toml b/core/Cargo.toml
index b195cd9d..f461ae10 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -16,9 +16,6 @@ petgraph = { version = "0.4.5", optional = true }
 thread-id = { version = "3.2.0", optional = true }
 backtrace = { version = "0.3.2", optional = true }
 
-[build-dependencies]
-autocfg = "0.1.6"
-
 [target.'cfg(unix)'.dependencies]
 libc = "0.2.55"