diff --git a/sys/hashes/pbkdf2.c b/sys/hashes/pbkdf2.c
index 4e89f391be53..ab580a000573 100644
--- a/sys/hashes/pbkdf2.c
+++ b/sys/hashes/pbkdf2.c
@@ -43,8 +43,8 @@ static void inplace_xor_digests(uint8_t *d1, const uint8_t *d2)
     }
 }
 
-void pbkdf2_sha256(const uint8_t *password, size_t password_len,
-                   const uint8_t *salt, size_t salt_len,
+void pbkdf2_sha256(const void *password, size_t password_len,
+                   const void *salt, size_t salt_len,
                    int iterations,
                    uint8_t *output)
 {
diff --git a/sys/include/hashes/pbkdf2.h b/sys/include/hashes/pbkdf2.h
index 11483ff2abb0..8e8541c72c1c 100644
--- a/sys/include/hashes/pbkdf2.h
+++ b/sys/include/hashes/pbkdf2.h
@@ -47,8 +47,8 @@ extern "C" {
  *                              recommended 10000
  * @param[out]  output          array of size PBKDF2_KEY_SIZE
  */
-void pbkdf2_sha256(const uint8_t *password, size_t password_len,
-                   const uint8_t *salt, size_t salt_len,
+void pbkdf2_sha256(const void *password, size_t password_len,
+                   const void *salt, size_t salt_len,
                    int iterations,
                    uint8_t *output);