diff --git a/Cargo.toml b/Cargo.toml
index 69ed15f824..fc6294ddec 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,6 +20,7 @@ include = [
   "Cargo.toml",
   "build.rs",
   "src/*.rs",
+  "src/**/*.rs",
 ]
 
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