diff --git a/library/cipher.c b/library/cipher.c
index a103c26..7534b2f 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -27,7 +27,11 @@
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#if !defined(POLARSSL_CONFIG_FILE)
 #include "polarssl/config.h"
+#else
+#include POLARSSL_CONFIG_FILE
+#endif
 
 #if defined(POLARSSL_CIPHER_C)