diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 66af7cf72..c51bb8dad 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -4088,7 +4088,7 @@ exit:
         psa_cipher_abort(operation);
     }
 
-    unlock_status = psa_unregister_read(slot);
+    unlock_status = psa_unregister_read_under_mutex(slot);
 
     return (status == PSA_SUCCESS) ? unlock_status : status;
 }