diff --git a/Cargo.toml b/Cargo.toml
index cab1d47..a27b617 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,6 @@ alpn = ["security-framework/alpn"]
 [target.'cfg(any(target_os = "macos", target_os = "ios"))'.dependencies]
 security-framework = "2.0.0"
 security-framework-sys = "2.0.0"
-once_cell = "1.0.0"
 libc = "0.2"
 tempfile = "3.1.0"
 
diff --git a/src/imp/security_framework.rs b/src/imp/security_framework.rs
index f56a916..511badf 100644
--- a/src/imp/security_framework.rs
+++ b/src/imp/security_framework.rs
@@ -1,5 +1,4 @@
 extern crate libc;
-extern crate once_cell;
 extern crate security_framework;
 extern crate security_framework_sys;
 extern crate tempfile;
@@ -21,8 +20,6 @@ use std::str;
 use std::sync::Mutex;
 use std::sync::Once;
 
-#[cfg(not(target_os = "ios"))]
-use self::once_cell::sync::Lazy;
 #[cfg(not(target_os = "ios"))]
 use self::security_framework::os::macos::certificate::{PropertyType, SecCertificateExt};
 #[cfg(not(target_os = "ios"))]
@@ -41,7 +38,7 @@ use {Protocol, TlsAcceptorBuilder, TlsConnectorBuilder};
 static SET_AT_EXIT: Once = Once::new();
 
 #[cfg(not(target_os = "ios"))]
-static TEMP_KEYCHAIN: Lazy<Mutex<Option<(SecKeychain, TempDir)>>> = Lazy::new(|| Mutex::new(None));
+static TEMP_KEYCHAIN: Mutex<Option<(SecKeychain, TempDir)>> = Mutex::new(None);
 
 fn convert_protocol(protocol: Protocol) -> SslProtocol {
     match protocol {