diff --git a/lib/des/engine.c b/lib/des/engine.c
index 7953debfb..a94567bfd 100644
--- a/lib/des/engine.c
+++ b/lib/des/engine.c
@@ -226,7 +226,7 @@ ENGINE_load_builtin_engines(void)
     ENGINE_set_id(engine, "builtin");
     ENGINE_set_name(engine, 
 		    "Heimdal crypto builtin engine version " PACKAGE_VERSION);
-    ENGINE_set_RSA(engine, RSA_null_method());
+    ENGINE_set_RSA(engine, RSA_imath_method());
     ENGINE_set_DH(engine, DH_imath_method());
 
     ret = add_engine(engine);