diff --git a/include/mbedtls/psa_util.h b/include/mbedtls/psa_util.h
index 93fb38d..3bf05d1 100644
--- a/include/mbedtls/psa_util.h
+++ b/include/mbedtls/psa_util.h
@@ -182,6 +182,8 @@
 }
 #endif /* MBEDTLS_PSA_CRYPTO_C */
 
+#if defined(MBEDTLS_PSA_UTIL_HAVE_ECDSA)
+
 #if defined(MBEDTLS_ASN1_WRITE_C)
 /** Convert an ECDSA signature from raw format (used by PSA APIs) to DER ASN.1
  * format (used by legacy crypto APIs).
@@ -220,6 +222,8 @@
                              size_t bits);
 #endif /* MBEDTLS_ASN1_PARSE_C */
 
+#endif /* MBEDTLS_PSA_UTIL_HAVE_ECDSA */
+
 /**@}*/
 
 #endif /* MBEDTLS_PSA_UTIL_H */