diff --git a/Cargo.toml b/Cargo.toml
index e7319ec..6e6c819 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ default = ["std"]
 std = ["parity-wasm/std"]
 # Enable for no_std support
 # hashbrown only works on no_std
-core = ["hashbrown", "libm"]
+core = ["hashbrown/nightly", "libm"]
 
 [dependencies]
 parity-wasm = { version = "0.31", default-features = false }