diff --git a/include/mbedtls/rsa.h b/include/mbedtls/rsa.h
index 9dd4e67..8146c90 100644
--- a/include/mbedtls/rsa.h
+++ b/include/mbedtls/rsa.h
@@ -552,6 +552,7 @@
                       const unsigned char *hash,
                       const unsigned char *sig );
 
+#if defined(MBEDTLS_ASN1PARSE_C)
 /**
  * \brief          Perform a PKCS#1 v1.5 verification (RSASSA-PKCS1-v1_5-VERIFY)
  *
@@ -578,6 +579,7 @@
                                  unsigned int hashlen,
                                  const unsigned char *hash,
                                  const unsigned char *sig );
+#endif /* MBEDTLS_ASN1PARSE_C */
 
 /**
  * \brief          Perform a PKCS#1 v2.1 PSS verification (RSASSA-PSS-VERIFY)