diff --git a/include/mbedtls/pkcs5.h b/include/mbedtls/pkcs5.h
index ec5cb9e..60027e8 100644
--- a/include/mbedtls/pkcs5.h
+++ b/include/mbedtls/pkcs5.h
@@ -43,6 +43,8 @@
 extern "C" {
 #endif
 
+#if defined(MBEDTLS_ASN1_PARSE_C)
+
 /**
  * \brief          PKCS#5 PBES2 function
  *
@@ -61,6 +63,8 @@
                  const unsigned char *data, size_t datalen,
                  unsigned char *output );
 
+#endif /* MBEDTLS_ASN1_PARSE_C */
+
 /**
  * \brief          PKCS#5 PBKDF2 using HMAC
  *