diff --git a/src/lib.rs b/src/lib.rs
index 2ef28fc6..d1195a4a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -52,7 +52,7 @@ pub mod int;
     all(target_arch = "mips", target_os = "none"),
     target_os = "xous",
     all(target_vendor = "fortanix", target_env = "sgx"),
-    target_env = "msvc"
+    target_os = "windows"
 ))]
 pub mod math;
 pub mod mem;
diff --git a/src/math.rs b/src/math.rs
index 21d23ff9..f8f9d225 100644
--- a/src/math.rs
+++ b/src/math.rs
@@ -97,7 +97,7 @@ no_mangle! {
     all(target_arch = "x86_64", target_os = "uefi"),
     all(target_arch = "xtensa", target_os = "none"),
     all(target_vendor = "fortanix", target_env = "sgx"),
-    target_env = "msvc"
+    target_os = "windows"
 ))]
 intrinsics! {
     pub extern "C" fn lgamma_r(x: f64, s: &mut i32) -> f64 {