diff --git a/riscvmodel/sim.py b/riscvmodel/sim.py
index 6ec37c8..c693e23 100644
--- a/riscvmodel/sim.py
+++ b/riscvmodel/sim.py
@@ -1,5 +1,4 @@
-from .model import Model, Memory
-from .isa import TerminateException
+from .model import Model, Memory, TerminateException
 
 import struct