diff --git a/src/lib.rs b/src/lib.rs
index 35351664caf4..1a07ce9aa12b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,7 +9,7 @@
 #![feature(is_some_with)]
 #![feature(nonzero_ops)]
 #![feature(local_key_cell_methods)]
-#![warn(rust_2018_idioms)]
+// Configure clippy and other lints
 #![allow(
     clippy::collapsible_else_if,
     clippy::collapsible_if,
@@ -24,6 +24,7 @@
     clippy::derive_hash_xor_eq,
     clippy::too_many_arguments
 )]
+#![warn(rust_2018_idioms, clippy::cast_lossless)]
 
 extern crate rustc_apfloat;
 extern crate rustc_ast;
diff --git a/src/shims/env.rs b/src/shims/env.rs
index f0818e71b667..c1d39dc09286 100644
--- a/src/shims/env.rs
+++ b/src/shims/env.rs
@@ -202,7 +202,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
         let env_block_ptr = this.read_pointer(env_block_op)?;
         let result = this.deallocate_ptr(env_block_ptr, None, MiriMemoryKind::Runtime.into());
         // If the function succeeds, the return value is nonzero.
-        Ok(result.is_ok() as i32)
+        Ok(i32::from(result.is_ok()))
     }
 
     fn setenv(
diff --git a/src/shims/tls.rs b/src/shims/tls.rs
index 13af447f76c6..9d19160b84d6 100644
--- a/src/shims/tls.rs
+++ b/src/shims/tls.rs
@@ -73,7 +73,7 @@ impl<'tcx> TlsData<'tcx> {
         self.keys.try_insert(new_key, TlsEntry { data: Default::default(), dtor }).unwrap();
         trace!("New TLS key allocated: {} with dtor {:?}", new_key, dtor);
 
-        if max_size.bits() < 128 && new_key >= (1u128 << max_size.bits() as u128) {
+        if max_size.bits() < 128 && new_key >= (1u128 << max_size.bits()) {
             throw_unsup_format!("we ran out of TLS key space");
         }
         Ok(new_key)
diff --git a/src/stacked_borrows/item.rs b/src/stacked_borrows/item.rs
index ad1b9b075b40..709b27d191b2 100644
--- a/src/stacked_borrows/item.rs
+++ b/src/stacked_borrows/item.rs
@@ -22,7 +22,7 @@ impl Item {
         assert!(tag.0.get() <= TAG_MASK);
         let packed_tag = tag.0.get();
         let packed_perm = perm.to_bits() << PERM_SHIFT;
-        let packed_protected = (protected as u64) << PROTECTED_SHIFT;
+        let packed_protected = u64::from(protected) << PROTECTED_SHIFT;
 
         let new = Self(packed_tag | packed_perm | packed_protected);