diff --git a/library/timing.c b/library/timing.c
index d8b5b46..f22591d 100644
--- a/library/timing.c
+++ b/library/timing.c
@@ -23,7 +23,11 @@
  *  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_SELF_TEST) && defined(POLARSSL_PLATFORM_C)
 #include "polarssl/platform.h"