diff --git a/src/lib.rs b/src/lib.rs
index 2400d55..72553b2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -79,6 +79,15 @@ pub trait System {
 /// Instances of this type are used to allocate blocks of memory. For best
 /// results only use one of these. Currently doesn't implement `Drop` to release
 /// lingering memory back to the OS. That may happen eventually though!
+#[cfg(any(target_os = "linux", target_arch = "wasm32", target_os = "macos"))]
+pub struct Dlmalloc<S = Platform>(dlmalloc::Dlmalloc<S>);
+
+/// An allocator instance
+///
+/// Instances of this type are used to allocate blocks of memory. For best
+/// results only use one of these. Currently doesn't implement `Drop` to release
+/// lingering memory back to the OS. That may happen eventually though!
+#[cfg(not(any(target_os = "linux", target_arch = "wasm32", target_os = "macos")))]
 pub struct Dlmalloc<S>(dlmalloc::Dlmalloc<S>);
 
 /// Constant initializer for `Dlmalloc` structure.