diff --git a/vlib/v/ast/table.v b/vlib/v/ast/table.v
index ed582f54c5..bb30ef0cda 100644
--- a/vlib/v/ast/table.v
+++ b/vlib/v/ast/table.v
@@ -1121,6 +1121,12 @@ pub fn (mut t Table) does_type_implement_interface(typ Type, inter_typ Type) boo
 	if typ_sym.language != .v {
 		return false
 	}
+	// generic struct don't generate cast interface fn
+	if typ_sym.info is Struct {
+		if typ_sym.info.is_generic {
+			return false
+		}
+	}
 	mut inter_sym := t.get_type_symbol(inter_typ)
 	if typ_sym.kind == .interface_ && inter_sym.kind == .interface_ {
 		return false
diff --git a/vlib/v/tests/generics_interface_decl_test.v b/vlib/v/tests/generics_interface_decl_test.v
new file mode 100644
index 0000000000..e96aa8dcb6
--- /dev/null
+++ b/vlib/v/tests/generics_interface_decl_test.v
@@ -0,0 +1,23 @@
+interface Depends {
+	depends() []Depends
+}
+
+struct Signal<T> {
+}
+
+fn (x Signal<T>) depends() []Depends {
+	return []
+}
+
+struct Add<T> {
+	a Signal<T>
+	b Signal<T>
+}
+
+fn (a Add<T>) depends() []Depends {
+	return [a.a, a.b]
+}
+
+fn test_generics_interface_decl() {
+	assert true
+}