diff --git a/Package@swift-4.swift b/Package@swift-4.swift
index 0493a62..4539e9f 100644
--- a/Package@swift-4.swift
+++ b/Package@swift-4.swift
@@ -21,6 +21,7 @@ import PackageDescription
 
 let package = Package(
     name: "OpenSSL",
+    pkgConfig: "openssl",
     providers: [
         .brew(["openssl"])
     ],