diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index 18891ac5ee..97ec3cd7eb 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -3555,6 +3555,9 @@ fn (mut p Parser) const_decl() ast.ConstDecl {
 		if p.tok.kind == .comma {
 			p.error_with_pos('const declaration do not support multiple assign yet', p.tok.pos())
 		}
+		if p.tok.kind == .decl_assign {
+			p.error_with_pos('cannot use `:=` to declare a const, use `=` instead', p.tok.pos())
+		}
 		p.check(.assign)
 		end_comments << p.eat_comments()
 		if p.tok.kind == .key_fn {
diff --git a/vlib/v/parser/tests/const_init_decl_assign_err.out b/vlib/v/parser/tests/const_init_decl_assign_err.out
new file mode 100644
index 0000000000..9099e5f7f4
--- /dev/null
+++ b/vlib/v/parser/tests/const_init_decl_assign_err.out
@@ -0,0 +1,5 @@
+vlib/v/parser/tests/const_init_decl_assign_err.vv:2:4: error: cannot use `:=` to declare a const, use `=` instead
+    1 | const (
+    2 |     a := 43
+      |       ~~
+    3 | )
diff --git a/vlib/v/parser/tests/const_init_decl_assign_err.vv b/vlib/v/parser/tests/const_init_decl_assign_err.vv
new file mode 100644
index 0000000000..9b9cafba4a
--- /dev/null
+++ b/vlib/v/parser/tests/const_init_decl_assign_err.vv
@@ -0,0 +1,3 @@
+const (
+	a := 43
+)