diff --git a/third_party/blurmac/Cargo.toml b/third_party/blurmac/Cargo.toml
index 84a051e4eb3..ec38e30b4d5 100644
--- a/third_party/blurmac/Cargo.toml
+++ b/third_party/blurmac/Cargo.toml
@@ -7,6 +7,7 @@ keywords = ["bluetooth", "ble", "macOS", "CoreBluetooth"]
 repository = "https://github.com/akosthekiss/blurmac"
 authors = ["Akos Kiss <akiss@inf.u-szeged.hu>"]
 license = "BSD-3-Clause"
+edition = "2018"
 
 [lib]
 name = "blurmac"