diff --git a/pynestml/utils/cloning_helpers.py b/pynestml/utils/cloning_helpers.py
index 5b9976c93..d1ca3b929 100644
--- a/pynestml/utils/cloning_helpers.py
+++ b/pynestml/utils/cloning_helpers.py
@@ -30,7 +30,7 @@ def clone_numeric_literal(numeric_literal):
         # Python basic type
         return numeric_literal
 
-    if type(numeric_literal) in [np.int, np.int8, np.int16, np.int32, np.int64]:
+    if type(numeric_literal) in [np.int8, np.int16, np.int32, np.int64, np.float64]:
         # NumPy types
         return numeric_literal.copy()