diff --git a/lslopt/lslbasefuncs.py b/lslopt/lslbasefuncs.py
index 17b62e7..4ffeb2f 100644
--- a/lslopt/lslbasefuncs.py
+++ b/lslopt/lslbasefuncs.py
@@ -351,7 +351,7 @@ def InternalTypecast(val, out, InList, f32):
             if not lslcommon.LSO and abs(ret) < 1.1754943508222875e-38:
                 # Mono doesn't return denormals when using (float)"val"
                 # (but it returns them when using (vector)"<val,...>")
-                ret = 0
+                ret = 0.0
             return ret
         if out == int:
             match = int_re.match(val)