diff --git a/Cargo.toml b/Cargo.toml
index a2fcc74..d323b72 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,11 @@ edition = "2021"
 name = "ms2rescore_rs"
 crate-type = ["cdylib"]
 
+[features]
+default = ["thermorawfilereader"]
+
+thermorawfilereader = ["mzdata/thermo"]
+
 [dependencies]
 pyo3 = "0.20.0"
 mzdata = "0.26.0"