diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index 9c61083..3522818 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -932,7 +932,7 @@
                               const uint8_t *input,
                               size_t input_length,
                               const uint8_t *hash,
-                              const size_t hash_length);
+                              size_t hash_length);
 
 /** The type of the state data structure for multipart hash operations.
  *