diff --git a/Cargo.lock b/Cargo.lock
index b8e0d6c..ed026f5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1976,6 +1976,7 @@ dependencies = [
  "serde_json",
  "strum 0.20.0",
  "strum_macros 0.20.1",
+ "syn 1.0.57",
  "tokio-core",
  "tokio-timer",
  "toml",
diff --git a/Cargo.toml b/Cargo.toml
index aba434c..dfbfdc2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,6 +46,7 @@ strum = "0.20.0"
 strum_macros = "0.20.1"
 libc = "0.2"
 regex = "1"
+syn = "=1.0.57"
 
 [dependencies.cursive]
 version = "0.15"