diff --git a/tests/src/drivers/signature.c b/tests/src/drivers/signature.c
index 028d24a..cea0351 100644
--- a/tests/src/drivers/signature.c
+++ b/tests/src/drivers/signature.c
@@ -262,6 +262,8 @@
     (void) alg;
     (void) hash;
     (void) hash_length;
+    (void) signature;
+    (void) signature_length;
 #endif /* defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECDSA_DETERMINISTIC) && \
           defined(MBEDTLS_SHA256_C) */