diff --git a/cli/src/repl.rs b/cli/src/repl.rs
index 8255ebfcf6..276aaa5d41 100644
--- a/cli/src/repl.rs
+++ b/cli/src/repl.rs
@@ -1,5 +1,6 @@
 use bumpalo::Bump;
 use inkwell::context::Context;
+use inkwell::execution_engine::ExecutionEngine;
 use inkwell::OptimizationLevel;
 use roc_builtins::unique::uniq_stdlib;
 use roc_can::constraint::Constraint;
@@ -287,6 +288,10 @@ fn gen(src: &[u8], target: Triple, opt_level: OptLevel) -> Result<ReplOutput, Fa
             .create_jit_execution_engine(OptimizationLevel::None)
             .expect("Error creating JIT execution engine for test");
 
+        // Without calling this, we get a linker error when building this crate
+        // in --release mode and then trying to eval anything in the repl.
+        ExecutionEngine::link_in_mc_jit();
+
         // Compile and add all the Procs before adding main
         let env = roc_gen::llvm::build::Env {
             arena: &arena,
diff --git a/compiler/mono/src/layout.rs b/compiler/mono/src/layout.rs
index 8cf3a1af2e..6c4b438b39 100644
--- a/compiler/mono/src/layout.rs
+++ b/compiler/mono/src/layout.rs
@@ -871,12 +871,6 @@ fn ext_var_is_empty_tag_union(_: &Subs, _: Variable) -> bool {
     unreachable!();
 }
 
-#[cfg(not(debug_assertions))]
-fn ext_var_is_empty_record(_: &Subs, _: Variable) -> bool {
-    // This should only ever be used in debug_assert! macros
-    unreachable!();
-}
-
 fn layout_from_num_content<'a>(content: Content) -> Result<Layout<'a>, LayoutProblem> {
     use roc_types::subs::Content::*;
     use roc_types::subs::FlatType::*;