diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index eed7943395b979d941a78ef21304b12c4aa6f689..d37f9aff3a723854b4e72f0fb04cb7d48db6a6fc 100755
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1137,7 +1137,7 @@
  *
  * Enable functions that use the filesystem.
  */
-// #define MBEDTLS_FS_IO
+#define MBEDTLS_FS_IO
 
 /**
  * \def MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES