diff --git a/sys/random/sha1prng.c b/sys/random/sha1prng.c
index 282b1b3ce5..6e7156715f 100644
--- a/sys/random/sha1prng.c
+++ b/sys/random/sha1prng.c
@@ -106,15 +106,6 @@ void _random_bytes(uint8_t *bytes, size_t size) /* TODO: use with global API */
     }
 }
 
-void random_init(uint32_t seed)
-{
-    sha1_init(&ctx);
-    sha1_update(&ctx, (void *)&seed, sizeof(uint32_t));
-    sha1_final(&ctx, digestdata);
-
-    /* copy seeded SHA1 state to PRNG state */
-    memcpy(prng_state, &ctx.state, 20);
-}
 void random_init_by_array(uint32_t init_key[], int key_length)
 {
     sha1_init(&ctx);
@@ -125,6 +116,11 @@ void random_init_by_array(uint32_t init_key[], int key_length)
     memcpy(prng_state, &ctx.state, STATE_SIZE);
 }
 
+void random_init(uint32_t seed)
+{
+    random_init_by_array((uint32_t *)&seed, sizeof(seed));
+}
+
 uint32_t random_uint32(void)
 {
     uint32_t ret;