diff --git a/src/lib.rs b/src/lib.rs
index a63b91a2..ae36c113 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -146,14 +146,14 @@ pub mod socket_embedded_nal_tcp;
 #[cfg(riot_module_periph_gpio)]
 pub mod gpio;
 
-#[cfg(riot_module_periph_hwrng)]
-pub mod hwrng;
+#[cfg(riot_module_periph_hwrng)] 
+mod hwrng;
 
 #[cfg(riot_module_periph_hwrng)]
 pub mod prng;
 
 #[cfg(all(riot_module_random, riot_module_prng_sha256prng))]
-pub mod random;
+mod random;
 
 #[cfg(riot_module_bluetil_ad)]
 pub mod bluetil;