diff --git a/programs/pkey/dh_client.c b/programs/pkey/dh_client.c
index c5c6f75..4e78d6f 100644
--- a/programs/pkey/dh_client.c
+++ b/programs/pkey/dh_client.c
@@ -239,7 +239,8 @@
     fflush( stdout );
 
     n = dhm.len;
-    if( ( ret = dhm_calc_secret( &dhm, buf, &n, NULL, NULL ) ) != 0 )
+    if( ( ret = dhm_calc_secret( &dhm, buf, &n,
+                                 ctr_drbg_random, &ctr_drbg ) ) != 0 )
     {
         printf( " failed\n  ! dhm_calc_secret returned %d\n\n", ret );
         goto exit;
diff --git a/programs/pkey/dh_server.c b/programs/pkey/dh_server.c
index 3382307..a657362 100644
--- a/programs/pkey/dh_server.c
+++ b/programs/pkey/dh_server.c
@@ -242,7 +242,8 @@
     printf( "\n  . Shared secret: " );
     fflush( stdout );
 
-    if( ( ret = dhm_calc_secret( &dhm, buf, &n, NULL, NULL ) ) != 0 )
+    if( ( ret = dhm_calc_secret( &dhm, buf, &n,
+                                 ctr_drbg_random, &ctr_drbg ) ) != 0 )
     {
         printf( " failed\n  ! dhm_calc_secret returned %d\n\n", ret );
         goto exit;