diff --git a/Cargo.toml b/Cargo.toml
index dedb16c..6a33b08 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,7 +46,7 @@ features = ["hardcoded-data"]
 default = ["std", "swash", "fontconfig"]
 fontconfig = ["fontdb/fontconfig", "std"]
 monospace_fallback = []
-no_std = ["hashbrown", "dep:libm", "skrifa/libm", "core_maths"]
+no_std = ["hashbrown", "dep:libm", "skrifa/libm", "core_maths", "swash?/libm"]
 peniko = []
 shape-run-cache = []
 std = [