diff --git a/wolfssl-sys/build.rs b/wolfssl-sys/build.rs
index 2f853965..fbd29c4d 100644
--- a/wolfssl-sys/build.rs
+++ b/wolfssl-sys/build.rs
@@ -366,7 +366,10 @@ fn build_wolfssl(wolfssl_src: &Path) -> PathBuf {
         }
         build_target::Arch::X86_64 => {
             // We don't need these build flag for iOS simulator
-            if build_target::target_os() != build_target::Os::iOS {
+            if !(build_target::target_os() == build_target::Os::iOS
+                && build_target::target_env()
+                    == build_target::Env::Other(String::from("sim")).into())
+            {
                 // Enable Intel ASM optmisations
                 conf.enable("intelasm", None);
                 // Enable AES hardware acceleration
@@ -455,7 +458,9 @@ fn build_wolfssl(wolfssl_src: &Path) -> PathBuf {
         }
 
         // Check if we are building for Mac Catalyst or iOS device
-        let arm64_arch = if env::var("CARGO_CFG_TARGET_ABI").unwrap_or_default() == "macabi" {
+        let arm64_arch = if build_target::target_env()
+            == build_target::Env::Other(String::from("macabi")).into()
+        {
             "arm64-apple-darwin"
         } else {
             "arm64-apple-ios"