diff --git a/vlib/v/fmt/struct.v b/vlib/v/fmt/struct.v
index 407f5daa46ee96..8355b5d23a8d3f 100644
--- a/vlib/v/fmt/struct.v
+++ b/vlib/v/fmt/struct.v
@@ -38,7 +38,7 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl, is_anon bool) {
 			if i < node.implements_types.len - 1 {
 				f.write(', ')
 			}
-			f.mark_types_import_as_used(t)
+			f.mark_types_import_as_used(t.typ)
 		}
 	}
 	// Calculate the alignments first