diff --git a/mongoc-sys/build.rs b/mongoc-sys/build.rs
index b02b741..296f226 100644
--- a/mongoc-sys/build.rs
+++ b/mongoc-sys/build.rs
@@ -37,7 +37,7 @@ fn main() {
         // Configure and install
         let mut command = Command::new("sh");
         command.arg("configure");
-        command.arg("--enable-ssl=yes");
+        command.arg("--enable-ssl=openssl");
         command.arg("--enable-sasl=no");
         command.arg("--enable-static=yes");
         command.arg("--enable-shared=no");
diff --git a/src/client.rs b/src/client.rs
index 48ddedb..3d65629 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -401,3 +401,6 @@ impl Drop for Uri {
         }
     }
 }
+
+unsafe impl Send for Uri { }
+unsafe impl Sync for Uri { }