diff --git a/bb8/Cargo.toml b/bb8/Cargo.toml
index d4f986d..480d163 100644
--- a/bb8/Cargo.toml
+++ b/bb8/Cargo.toml
@@ -14,7 +14,7 @@ futures-util = { version = "0.3.2", default-features = false, features = ["alloc
 parking_lot = { version = "0.12", optional = true }
 tokio = { version = "1.0", features = ["rt", "sync", "time"] }
 
-[target.'cfg(not(target_has_atomic = "u64"))'.dependencies]
+[target.'cfg(not(target_has_atomic = "64"))'.dependencies]
 portable-atomic = "1"
 
 [dev-dependencies]