diff --git a/vlib/v/checker/tests/main_and_script_err.out b/vlib/v/checker/tests/main_and_script_err.out
deleted file mode 100644
index 71b5f75084..0000000000
--- a/vlib/v/checker/tests/main_and_script_err.out
+++ /dev/null
@@ -1,5 +0,0 @@
-vlib/v/checker/tests/main_and_script_err.vv:1:1: error: function `main` is already defined
-    1 | fn main() {
-      | ^
-    2 |     println('main')
-    3 | }
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index 55000ac7c4..8e216c2776 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -693,6 +693,10 @@ pub fn (mut p Parser) top_stmt() ast.Stmt {
 					p.script_mode = true
 					p.script_mode_start_token = p.tok
 
+					if p.table.known_fn('main.main') {
+						p.error('function `main` is already defined, put your script statements inside it')
+					}
+
 					p.open_scope()
 					mut stmts := []ast.Stmt{}
 					for p.tok.kind != .eof {
diff --git a/vlib/v/parser/tests/main_and_script_err.out b/vlib/v/parser/tests/main_and_script_err.out
new file mode 100644
index 0000000000..0ec7a9f259
--- /dev/null
+++ b/vlib/v/parser/tests/main_and_script_err.out
@@ -0,0 +1,5 @@
+vlib/v/parser/tests/main_and_script_err.vv:4:1: error: function `main` is already defined, put your script statements inside it
+    2 |     println('main')
+    3 | }
+    4 | println('out')
+      | ~~~~~~~
diff --git a/vlib/v/checker/tests/main_and_script_err.vv b/vlib/v/parser/tests/main_and_script_err.vv
similarity index 100%
rename from vlib/v/checker/tests/main_and_script_err.vv
rename to vlib/v/parser/tests/main_and_script_err.vv