--- a/crates/jrsonnet-evaluator/src/lib.rs
+++ b/crates/jrsonnet-evaluator/src/lib.rs
@@ -41,6 +41,10 @@
 	clippy::missing_const_for_fn,
 	// too many false-positives with .expect() calls
 	clippy::missing_panics_doc,
+    // false positive for IStr type. There is an configuration option for
+    // such cases, but it doesn't work:
+    // https://github.com/rust-lang/rust-clippy/issues/9801
+    clippy::mutable_key_type,
 )]
 
 // For jrsonnet-macros