diff --git a/brilirs/src/check.rs b/brilirs/src/check.rs
index f14a56e12..d115ea4d5 100644
--- a/brilirs/src/check.rs
+++ b/brilirs/src/check.rs
@@ -508,6 +508,11 @@ fn type_check_instruction<'a>(
 }
 
 fn type_check_func(bbfunc: &BBFunction, bbprog: &BBProgram) -> Result<(), PositionalInterpError> {
+  if bbfunc.name == "main" && bbfunc.return_type.is_some() {
+    return Err(InterpError::NonEmptyRetForFunc(bbfunc.name.clone()))
+      .map_err(|e| e.add_pos(bbfunc.pos.clone()));
+  }
+
   let mut env: FxHashMap<&str, &Type> =
     FxHashMap::with_capacity_and_hasher(20, fxhash::FxBuildHasher::default());
   bbfunc.args.iter().for_each(|a| {
diff --git a/brilirs/src/interp.rs b/brilirs/src/interp.rs
index 17c5a5596..de8d5fdab 100644
--- a/brilirs/src/interp.rs
+++ b/brilirs/src/interp.rs
@@ -796,11 +796,6 @@ pub fn execute_main<T: std::io::Write, U: std::io::Write>(
     .map(|i| prog.get(i).unwrap())
     .ok_or(InterpError::NoMainFunction)?;
 
-  if main_func.return_type.is_some() {
-    return Err(InterpError::NonEmptyRetForFunc(main_func.name.clone()))
-      .map_err(|e| e.add_pos(main_func.pos.clone()));
-  }
-
   let mut env = Environment::new(main_func.num_of_vars);
   let heap = Heap::default();