diff --git a/candle-core/src/metal_backend/mod.rs b/candle-core/src/metal_backend/mod.rs
index 6f560c02e..34931c9df 100644
--- a/candle-core/src/metal_backend/mod.rs
+++ b/candle-core/src/metal_backend/mod.rs
@@ -1865,9 +1865,9 @@ impl BackendDevice for MetalDevice {
         let device = metal::Device::all().swap_remove(ordinal);
         let command_queue = device.new_command_queue();
         let kernels = Arc::new(Kernels::new());
-        let use_mlx_mm = match std::env::var("CANDLE_USE_MLX_MM").as_deref() {
-            Ok("false") | Ok("False") | Ok("FALSE") | Ok("0") | Err(_) => false,
-            Ok(_) => true,
+        let use_mlx_mm = match std::env::var("CANDLE_USE_MFA_MM").as_deref() {
+            Ok("false") | Ok("False") | Ok("FALSE") | Ok("0") | Err(_) => true,
+            Ok(_) => false,
         };
         let seed = Arc::new(Mutex::new(device.new_buffer_with_data(
             [299792458].as_ptr() as *const c_void,