diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 210fa5f..94f6b17 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -2164,6 +2164,12 @@
     key_slot_t *slot;
     psa_status_t status;
 
+    (void) input;
+    (void) input_length;
+    (void) salt;
+    (void) output;
+    (void) output_size;
+
     *output_length = 0;
 
     if( ! PSA_ALG_IS_RSA_OAEP( alg ) && salt_length != 0 )
@@ -2238,6 +2244,12 @@
     key_slot_t *slot;
     psa_status_t status;
 
+    (void) input;
+    (void) input_length;
+    (void) salt;
+    (void) output;
+    (void) output_size;
+
     *output_length = 0;
 
     if( ! PSA_ALG_IS_RSA_OAEP( alg ) && salt_length != 0 )