diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 3dfc347e9a6446b2a432027652e57a427b52845e..2c391f39e1eb3009210a2a5da84c2d5258635310 100755
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2334,7 +2334,7 @@
  *             See dhm.h for more details.
  *
  */
-// #define MBEDTLS_DHM_C
+#define MBEDTLS_DHM_C
 
 /**
  * \def MBEDTLS_ECDH_C