diff --git a/frontend-wasm/src/module/build_ir.rs b/frontend-wasm/src/module/build_ir.rs
index 2a7da134..7aeea970 100644
--- a/frontend-wasm/src/module/build_ir.rs
+++ b/frontend-wasm/src/module/build_ir.rs
@@ -124,7 +124,12 @@ pub fn build_ir_module(
         let func_name = &parsed_module.module.func_name(*func_index);
         let wasm_func_type = module_types[func_type.signature].clone();
         let ir_func_type = ir_func_type(&wasm_func_type, &session.diagnostics)?;
-        let sig = ir_func_sig(&ir_func_type, CallConv::SystemV, Linkage::External);
+        let linkage = if parsed_module.module.is_exported_function(func_index) {
+            Linkage::External
+        } else {
+            Linkage::Internal
+        };
+        let sig = ir_func_sig(&ir_func_type, CallConv::SystemV, linkage);
         let mut module_func_builder = module_builder.function(func_name.as_str(), sig.clone())?;
         let FunctionBodyData { validator, body } = body_data;
         let mut func_validator = validator.into_validator(Default::default());
diff --git a/frontend-wasm/src/module/mod.rs b/frontend-wasm/src/module/mod.rs
index 58952595..d55ec589 100644
--- a/frontend-wasm/src/module/mod.rs
+++ b/frontend-wasm/src/module/mod.rs
@@ -199,6 +199,13 @@ impl Module {
         index.index() < self.num_imported_funcs
     }
 
+    pub fn is_exported_function(&self, index: &FuncIndex) -> bool {
+        self.exports.values().any(|export| match export {
+            EntityIndex::Function(func_id) => func_id == index,
+            _ => false,
+        })
+    }
+
     /// Convert a `DefinedTableIndex` into a `TableIndex`.
     #[inline]
     pub fn table_index(&self, defined_table: DefinedTableIndex) -> TableIndex {