diff --git a/library/dhm.c b/library/dhm.c
index 0c65dfe..a5c3e90 100644
--- a/library/dhm.c
+++ b/library/dhm.c
@@ -249,10 +249,15 @@
  * Derive and export the shared secret (G^Y)^X mod P
  */
 int dhm_calc_secret( dhm_context *ctx,
-                     unsigned char *output, size_t *olen )
+                     unsigned char *output, size_t *olen,
+                     int (*f_rng)(void *, unsigned char *, size_t),
+                     void *p_rng )
 {
     int ret;
 
+    (void) f_rng;
+    (void) p_rng;
+
     if( ctx == NULL || *olen < ctx->len )
         return( POLARSSL_ERR_DHM_BAD_INPUT_DATA );