diff --git a/programs/pkey/dh_server.c b/programs/pkey/dh_server.c
index fb9c082..c948233 100644
--- a/programs/pkey/dh_server.c
+++ b/programs/pkey/dh_server.c
@@ -276,7 +276,9 @@
 
 exit:
 
-    net_close( client_fd );
+    if( client_fd != -1 )
+        net_close( client_fd );
+
     rsa_free( &rsa );
     dhm_free( &dhm );