diff --git a/Cargo.toml b/Cargo.toml
index fe415e8b..5b506221 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -64,7 +64,7 @@ debugging = ["internals"]       # enable debugging
 serde = ["dep:serde", "smartstring/serde", "smallvec/serde"] # implement serde for rhai types
 
 # compiling for no-std
-no_std = ["no-std-compat", "num-traits/libm", "core-error", "libm"]
+no_std = ["no-std-compat", "num-traits/libm", "core-error", "libm", "hashbrown"]
 
 # compiling for WASM
 wasm-bindgen = ["instant/wasm-bindgen"]