diff --git a/binarycpython/utils/functions.py b/binarycpython/utils/functions.py
index fc107281a492f6fee8ab4148cc45a5c938396137..0786114214f9b6a0e534c2eedc9e71cfbea63979 100644
--- a/binarycpython/utils/functions.py
+++ b/binarycpython/utils/functions.py
@@ -1736,12 +1736,12 @@ def merge_dicts(dict_1: dict, dict_2: dict) -> dict:
         # floats will be added, lists will be appended (though that might change) and dicts will be
         # dealt with by calling this function again.
         else:
-            # ints
             # Booleans (has to be the type Bool, not just a 0 or 1)
             if isinstance(dict_1[key], bool) and isinstance(dict_2[key], bool):
                 new_dict[key] = dict_1[key] or dict_2[key]
 
-            elif isinstance(dict_1[key], int) and isinstance(dict_2[key], int):
+            # ints
+            elif isinstance(dict_1[key], (int, np.int64)) and isinstance(dict_2[key], (int, np.int64)):
                 new_dict[key] = dict_1[key] + dict_2[key]
 
             # floats