diff --git a/library/camellia.c b/library/camellia.c
index f007a46..4bf0b29 100644
--- a/library/camellia.c
+++ b/library/camellia.c
@@ -29,7 +29,11 @@
  *  http://info.isl.ntt.co.jp/crypt/eng/camellia/dl/01espec.pdf
  */
 
+#if !defined(POLARSSL_CONFIG_FILE)
 #include "polarssl/config.h"
+#else
+#include POLARSSL_CONFIG_FILE
+#endif
 
 #if defined(POLARSSL_CAMELLIA_C)