diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 6dec490c8..53da54616 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -5091,6 +5091,7 @@ psa_status_t psa_key_derivation_output_bytes(
 #endif /* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF ||
         * MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS */
     {
+        (void) kdf_alg;
         return( PSA_ERROR_BAD_STATE );
     }
 
@@ -5575,6 +5576,9 @@ static psa_status_t psa_key_derivation_input_internal(
 #endif /* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS */
     {
         /* This can't happen unless the operation object was not initialized */
+        (void) data;
+        (void) data_length;
+        (void) kdf_alg;
         return( PSA_ERROR_BAD_STATE );
     }