diff --git a/libs/profiles/src/lib.rs b/libs/profiles/src/lib.rs
index fc79c588e..3e5efca86 100644
--- a/libs/profiles/src/lib.rs
+++ b/libs/profiles/src/lib.rs
@@ -9,6 +9,7 @@ enum CpuOptLevel {
     none,
     native,
     neon_v8,
+    x86_64_legacy, // don't use this it's the oldest and worst. unless you've got a really old CPU, in which case, sorry?
     x86_64_v2,
     x86_64_v3,
 }
@@ -31,6 +32,7 @@ impl std::fmt::Display for CpuOptLevel {
             CpuOptLevel::none => write!(f, "none"),
             CpuOptLevel::native => write!(f, "native"),
             CpuOptLevel::neon_v8 => write!(f, "neon_v8"),
+            CpuOptLevel::x86_64_legacy => write!(f, "x86_64"),
             CpuOptLevel::x86_64_v2 => write!(f, "x86_64_v2"),
             CpuOptLevel::x86_64_v3 => write!(f, "x86_64_v3"),
         }
@@ -66,6 +68,7 @@ pub fn apply_profile() {
         CpuOptLevel::neon_v8 => {
             println!("cargo:rustc-env=RUSTFLAGS=-Ctarget-features=+neon,+fp-armv8")
         }
+        CpuOptLevel::x86_64_legacy => println!("cargo:rustc-env=RUSTFLAGS=-Ctarget-cpu=x86-64"),
         CpuOptLevel::x86_64_v2 => println!("cargo:rustc-env=RUSTFLAGS=-Ctarget-cpu=x86-64-v2"),
         CpuOptLevel::x86_64_v3 => println!("cargo:rustc-env=RUSTFLAGS=-Ctarget-cpu=x86-64-v3"),
     }