diff --git a/Project.toml b/Project.toml
index f35d922..2ce6fd8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -7,3 +7,6 @@ version = "0.1.0"
 HTTP = "cd3eb016-35fb-5094-929b-558a96fad6f3"
 JSON3 = "0f8b85d8-7281-11e9-16c2-39a750bddbf1"
 StructTypes = "856f2bd8-1eba-4b0a-8007-ebc267875bd4"
+
+[compat]
+StructTypes = "1"