diff --git a/lslopt/lslfoldconst.py b/lslopt/lslfoldconst.py
index e620d76..416bc4e 100644
--- a/lslopt/lslfoldconst.py
+++ b/lslopt/lslfoldconst.py
@@ -23,7 +23,7 @@ import lslfuncs
 from lslfuncs import NULL_KEY, ZERO_VECTOR, ZERO_ROTATION
 import math
 from lslparse import warning
-from lslfuncparams import OptimizeParams
+from lslfuncopt import OptimizeParams
 
 class foldconst(object):
 
diff --git a/lslopt/lslfuncparams.py b/lslopt/lslfuncopt.py
similarity index 100%
rename from lslopt/lslfuncparams.py
rename to lslopt/lslfuncopt.py