diff --git a/include/openssl/cpu.h b/include/openssl/cpu.h
index dad544e7f6..3f5fe66d5d 100644
--- a/include/openssl/cpu.h
+++ b/include/openssl/cpu.h
@@ -98,6 +98,14 @@ extern uint32_t OPENSSL_ia32cap_P[4];
 #if defined(OPENSSL_APPLE)
 /* iOS builds use the static ARM configuration. */
 #define OPENSSL_STATIC_ARMCAP
+
+#if defined(OPENSSL_AARCH64)
+#define OPENSSL_STATIC_ARMCAP_AES
+#define OPENSSL_STATIC_ARMCAP_SHA1
+#define OPENSSL_STATIC_ARMCAP_SHA256
+#define OPENSSL_STATIC_ARMCAP_PMULL
+#endif
+
 #endif
 
 #if !defined(OPENSSL_STATIC_ARMCAP)
diff --git a/src/init.rs b/src/init.rs
index 7b5dcf7fdf..c8745c658a 100644
--- a/src/init.rs
+++ b/src/init.rs
@@ -14,12 +14,18 @@
 
 #[allow(unsafe_code)]
 #[inline(always)]
+#[cfg(not(all(target_arch = "aarch64", target_os = "ios")))]
 pub fn init_once() {
     extern crate std;
     static INIT: std::sync::Once = std::sync::ONCE_INIT;
     INIT.call_once(|| unsafe { OPENSSL_cpuid_setup() });
 }
 
+#[cfg(not(all(target_arch = "aarch64", target_os = "ios")))]
 extern {
     fn OPENSSL_cpuid_setup();
 }
+
+#[cfg(all(target_arch = "aarch64", target_os = "ios"))]
+pub fn init_once() {
+}