diff --git a/Cargo.toml b/Cargo.toml
index a93f1a9..9e4e1f2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,15 @@ authors = ["gnxlxnxx <gnxlxnxx@web.de>"]
 edition = "2018"
 name = "psoc4-pac"
 version = "0.1.0"
+
 [dependencies]
 bare-metal = "*"
 cortex-m = "*"
 vcell = "*"
+
+[dependencies.cortex-m-rt]
+optional = true
+version = "*"
+
+[features]
+rt = ["cortex-m-rt/device"]