diff --git a/cpufeatures/src/x86.rs b/cpufeatures/src/x86.rs
index c973b744..eb1c359e 100644
--- a/cpufeatures/src/x86.rs
+++ b/cpufeatures/src/x86.rs
@@ -14,11 +14,12 @@ macro_rules! __unless_target_features {
     ($($tf:tt),+ => $body:expr ) => {{
         #[cfg(not(all($(target_feature=$tf,)*)))]
         {
-            #[cfg(not(target_env = "sgx"))]
+            #[cfg(not(any(target_env = "sgx", target_os = "none", target_os = "uefi")))]
             $body
 
-            // CPUID is not available on SGX targets
-            #[cfg(target_env = "sgx")]
+            // CPUID is not available on SGX. Freestanding and UEFI targets
+            // do not support SIMD features with default compilation flags.
+            #[cfg(any(target_env = "sgx", target_os = "none", target_os = "uefi"))]
             false
         }