diff --git a/coremltools/converters/mil/mil/types/type_mapping.py b/coremltools/converters/mil/mil/types/type_mapping.py
index e686b8bed..9f5d77b9f 100644
--- a/coremltools/converters/mil/mil/types/type_mapping.py
+++ b/coremltools/converters/mil/mil/types/type_mapping.py
@@ -298,6 +298,8 @@ def numpy_type_to_builtin_type(nptype):
         return types_uint64
     elif np.issubclass_(nptype, np.int64):
         return types_int64
+    elif np.issubclass_(nptype, np.intc):
+        return types_int32
     elif np.issubclass_(nptype, int) or nptype == int:
         # Catch all int
         return types_int32