diff --git a/programs/pkey/dh_client.c b/programs/pkey/dh_client.c
index 51da9ab..12b2eff 100644
--- a/programs/pkey/dh_client.c
+++ b/programs/pkey/dh_client.c
@@ -275,7 +275,9 @@
 
 exit:
 
-    net_close( server_fd );
+    if( server_fd != -1 )
+        net_close( server_fd );
+
     rsa_free( &rsa );
     dhm_free( &dhm );