diff --git a/Cargo.toml b/Cargo.toml
index 18b0b5a..c21a3c9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,3 +15,10 @@ license = "Apache-2.0/MIT"
 cortex-m = "0.3.1"
 bare-metal = "0.1.1"
 vcell = "0.1.0"
+
+[dependencies.cortex-m-rt]
+optional = true
+version = "0.3.6"
+
+[features]
+rt = ["cortex-m-rt"]
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