diff --git a/Cargo.toml b/Cargo.toml
index c911cf6..3c8d50b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,3 +24,5 @@ ics = "0.5"
 futures = "0.3"
 lettre = "0.11"
 
+[target.'cfg(not(windows))'.dependencies]
+openssl = { version = "0.10", features = [ "vendored" ] }