diff --git a/Sources/ZPack/Extensions/Swift/Float+Extension.swift b/Sources/ZPack/Extensions/Swift/Float+Extension.swift
index f7205b4..564c006 100644
--- a/Sources/ZPack/Extensions/Swift/Float+Extension.swift
+++ b/Sources/ZPack/Extensions/Swift/Float+Extension.swift
@@ -2,7 +2,9 @@ extension Float {
     public var radians: Float {
         self / 180 * .pi
     }
+#if arch(arm64)
     public var half: Float16 {
         Float16(self)
     }
+#endif
 }